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Articles 1 - 30 of 146
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Understanding The Catalytic Active Sites Of Crystalline Cosbxoy For Electrochemical Chlorine Evolution, Heng Dong, Xiaohan Shao, Shane Hancox, Sean T. Mcbeath, William A. Tarpeh, Michael R. Hoffmann
Understanding The Catalytic Active Sites Of Crystalline Cosbxoy For Electrochemical Chlorine Evolution, Heng Dong, Xiaohan Shao, Shane Hancox, Sean T. Mcbeath, William A. Tarpeh, Michael R. Hoffmann
Civil and Environmental Engineering Faculty Publication Series
The chlorine evolution reaction (CER) is a key reaction in electrochemical oxidation (EO) of water treatment. Conventional anodes based on platinum group metals can be prohibitively expensive, which hinders further application of EO systems. Crystalline cobalt antimonate (CoSbxOy) was recently identified as a promising alternative to conventional anodes due to its high catalytic activity and stability in acidic media. However, its catalytic sites and reaction mechanism have not yet been elucidated. This study sheds light on the catalytically active sites in crystalline CoSbxOy anodes by using scanning electrochemical microscopy to compare the CER …
Low-Flow (7-Day, 10-Year) Classical Statistical And Improved Machine Learning Estimation Methodologies, Andrew Delsanto, Md Abul Ehsan Bhuiyan, Konstantinos M. Andreadis, Richard N. Palmer
Low-Flow (7-Day, 10-Year) Classical Statistical And Improved Machine Learning Estimation Methodologies, Andrew Delsanto, Md Abul Ehsan Bhuiyan, Konstantinos M. Andreadis, Richard N. Palmer
Civil and Environmental Engineering Faculty Publication Series
Water resource managers require accurate estimates of the 7-day, 10-year low flow (7Q10) of streams for many reasons, including protecting aquatic species, designing wastewater treatment plants, and calculating municipal water availability. StreamStats, a publicly available web application developed by the United States Geologic Survey that is commonly used by resource managers for estimating the 7Q10 in states where it is available, utilizes state-by-state, locally calibrated regression equations for estimation. This paper expands StreamStats’ methodology and improves 7Q10 estimation by developing a more regionally applicable and generalized methodology for 7Q10 estimation. In addition to classical methodologies, namely multiple linear regression (MLR) …
Peace-Athabasca Delta Water Surface Elevations And Slopes Mapped From Airswot Ka-Band Insar, Colin J. Gleason, Et. Al.
Peace-Athabasca Delta Water Surface Elevations And Slopes Mapped From Airswot Ka-Band Insar, Colin J. Gleason, Et. Al.
Civil and Environmental Engineering Faculty Publication Series
In late 2023 the Surface Water and Ocean Topography (SWOT) satellite mission will release unprecedented high-resolution measurements of water surface elevation (WSE) and water surface slope (WSS) globally. SWOT’s exciting Ka-band near-nadir wide-swath interferometric radar (InSAR) technology could transform studies of surface water hydrology, but remains highly experimental. We examine Airborne SWOT (AirSWOT) data acquired twice over Canada’s Peace-Athabasca Delta (PAD), a large, low-gradient, ecologically important riverine wetland complex. While noisy and susceptible to “dark water” (low-return) data losses, spatially averaged AirSWOT WSE observations reveal a broad-scale water-level decline of ~44 cmn (σ =271 cm) between 9 July and 13 …
Dynamic Trajectory Planning For Automated Lane Changing Using The Quintic Polynomial Curve, Yang Li, Linbo Li, Daiheng Ni
Dynamic Trajectory Planning For Automated Lane Changing Using The Quintic Polynomial Curve, Yang Li, Linbo Li, Daiheng Ni
Civil and Environmental Engineering Faculty Publication Series
As one of the key algorithms in supporting AV (autonomous vehicle) to complete the LC (lane changing) maneuver, the LTP (LC trajectory planning) algorithm generates safe and efficient LC trajectory for the AV. This paper proposes a novel dynamic LTP algorithm based on the quintic polynomial curve. This algorithm is capable of adjusting LC trajectory according to the state changes of the surrounding driving environment. The formulation of our proposed algorithm mainly consists the underlying form of trajectory equation, the optimization objective function, the corresponding constrains, and the SQP (sequential quadratic programming) algorithm. For each planning step, the time-based quintic …
Strength–Dilatancy And Critical State Behaviours Of Binary Mixtures Of Graded Sands Influenced By Particle Size Ratio And Fines Content, Yuksel Yilmaz, Yibing Deng, Ching S. Chang, Aydin Gokce
Strength–Dilatancy And Critical State Behaviours Of Binary Mixtures Of Graded Sands Influenced By Particle Size Ratio And Fines Content, Yuksel Yilmaz, Yibing Deng, Ching S. Chang, Aydin Gokce
Civil and Environmental Engineering Faculty Publication Series
Binary granular soil mixtures, as common heterogeneous soils, are ubiquitous in nature and man-made deposits. Fines content and particle size ratio are two important gradation parameters for a binary mixture, which have potential influences on mechanical behaviours. However, experimental studies on drained shear behaviour considering the whole range of fines content and different particle size ratios are scarce in the literature. For this purpose, a series of drained triaxial compression tests was performed on dense binary silica sand mixtures with four different particle size ratios to investigate systematically the effects of fines content and particle size ratio on the drained …
Recent Changes To Arctic River Discharge, Dongmei Feng, Colin J. Gleason, Peirong Lin, Xiao Yang, Ming Pan, Yuta Ishitsuka
Recent Changes To Arctic River Discharge, Dongmei Feng, Colin J. Gleason, Peirong Lin, Xiao Yang, Ming Pan, Yuta Ishitsuka
Civil and Environmental Engineering Faculty Publication Series
Arctic rivers drain ~15% of the global land surface and significantly influence local communities and economies, freshwater and marine ecosystems, and global climate. However, trusted and public knowledge of pan-Arctic rivers is inadequate, especially for small rivers and across Eurasia, inhibiting understanding of the Arctic response to climate change. Here, we calculate daily streamflow in 486,493 pan-Arctic river reaches from 1984-2018 by assimilating 9.18 million river discharge estimates made from 155,710 satellite images into hydrologic model simulations. We reveal larger and more heterogenous total water export (3-17% greater) and water export acceleration (factor of 1.2-3.3 larger) than previously reported, with …
Probabilistic Evaluation Of Drought In Cmip6 Simulations, Simon Michael Papalexiou, Chandra Rupa Rajulapati, Konstantinos M. Andreadis, Efi Foufoula-Georgiou, Martyn P. Clark, Kevin E. Trenberth
Probabilistic Evaluation Of Drought In Cmip6 Simulations, Simon Michael Papalexiou, Chandra Rupa Rajulapati, Konstantinos M. Andreadis, Efi Foufoula-Georgiou, Martyn P. Clark, Kevin E. Trenberth
Civil and Environmental Engineering Faculty Publication Series
As droughts have widespread social and ecological impacts, it is critical to develop long-term adaptation and mitigation strategies to reduce drought vulnerability. Climate models are important in quantifying drought changes. Here, we assess the ability of 285 CMIP6 historical simulations, from 17 models, to reproduce drought duration and severity in three observational data sets using the Standardized Precipitation Index (SPI). We used summary statistics beyond the mean and standard deviation, and devised a novel probabilistic framework, based on the Hellinger distance, to quantify the difference between observed and simulated drought characteristics. Results show that many simulations have less than error …
Li-Ion Batteries For Peak Shaving, Price Arbitrage, And Photovoltaic Self-Consumption In Commercial Buildings: A Monte Carlo Analysis, Pietro Elia Campana, Luca Cioccolanti, Baptiste François, Jakub Jurasz, Yang Zhang, Maria Varini, Bengt Stridh, Jinyue Yan
Li-Ion Batteries For Peak Shaving, Price Arbitrage, And Photovoltaic Self-Consumption In Commercial Buildings: A Monte Carlo Analysis, Pietro Elia Campana, Luca Cioccolanti, Baptiste François, Jakub Jurasz, Yang Zhang, Maria Varini, Bengt Stridh, Jinyue Yan
Civil and Environmental Engineering Faculty Publication Series
This study investigates the benefits of introducing Li-ion batteries as energy storage unit in the commercial sector by considering a representative building with a photovoltaic system. Only the costs and revenues related to the installation and operation of the battery are considered in this study. The operational strategy of the battery consists in balancing the following processes through day-ahead forecasts for both electricity consumption and photovoltaic production: shaving a targeted peak, performing price arbitrage, and increasing photovoltaic self-consumption. By reviewing the electricity price cost for commercial buildings from several companies around the world, a general electricity price structure is defined. …
A Continuous Model For Coordinated Pricing Of Mixed Access Modes To Transit, Nicholas Fournier, Eleni Christofa, Eric J. Gonzales
A Continuous Model For Coordinated Pricing Of Mixed Access Modes To Transit, Nicholas Fournier, Eleni Christofa, Eric J. Gonzales
Civil and Environmental Engineering Faculty Publication Series
The land-use pattern for many cities is a central business district surrounded by sprawling suburbs. This pattern can lead to an inefficient and congestion-prone transportation system due to a reliance on automobiles. This is because high-capacity transit is inefficient in low-density areas where insufficient travelers can access transit. This also poses an equity concern as the monetary cost of faster and more expensive travel disproportionately burdens low income travelers, especially when fixed congestion pricing is imposed. This paper presents a deterministic approximation of a discrete choice model for mixed access and mainline transportation modes, meaning that travelers may use different …
Surface Runoff Responses To Suburban Growth: An Integration Of Remote Sensing, Gis, And Curve Number, Khurshid Jahan, Soni M. Pradhanang, Md Abul Ehsan Bhuiyan
Surface Runoff Responses To Suburban Growth: An Integration Of Remote Sensing, Gis, And Curve Number, Khurshid Jahan, Soni M. Pradhanang, Md Abul Ehsan Bhuiyan
Civil and Environmental Engineering Faculty Publication Series
Suburban growth and its impacts on surface runoff were investigated using the soil conservation service curve number (SCS-CN) model, compared with the integrated advanced remote sensing and geographic information system (GIS)-based integrated approach, over South Kingston, Rhode Island, USA. This study analyzed and employed the supervised classification method on four Landsat images from 1994, 2004, 2014, and 2020 to detect land-use pattern changes through remote sensing applications. Results showed that 68.6% urban land expansion was reported from 1994 to 2020 in this suburban area. After land-use change detection, a GIS-based SCS-CN model was developed to examine suburban growth and surface …
Exploring The Use Of A Sanitation Safety Plan Framework To Identify Key Hazards In First Nations Wastewater Systems, Kaycie Lane, Megan Fuller, Toni Stanhope, Amina Stoddart
Exploring The Use Of A Sanitation Safety Plan Framework To Identify Key Hazards In First Nations Wastewater Systems, Kaycie Lane, Megan Fuller, Toni Stanhope, Amina Stoddart
Civil and Environmental Engineering Faculty Publication Series
First Nations communities in Canada have a documented history of sub-standard water quality. While efforts have been made to address drinking water quality, little has been done to address longstanding challenges in wastewater systems. This study developed a hazard identification checklist using a sanitation safety plan (SSP) framework to characterize potential hazards in 29 First Nations wastewater systems in Atlantic Canada. System types included in this study included centralized, decentralized, and municipal transfer agreements (MTAs). Using past system assessment reports, potential hazardous events were evaluated along the sanitation chain to assess risk within systems. Overall, 69% of hazardous events had …
Activity-Based Epidemic Propagation And Contact Network Scaling In Auto-Depending Metropolitan Areas, Nishant Kumar, Jimi Oke, Bat-Hen Nahimias-Biran
Activity-Based Epidemic Propagation And Contact Network Scaling In Auto-Depending Metropolitan Areas, Nishant Kumar, Jimi Oke, Bat-Hen Nahimias-Biran
Civil and Environmental Engineering Faculty Publication Series
We build on recent work to develop a fully mechanistic, activity-based and highly spatio-temporally resolved epidemiological model which leverages person-trajectories obtained from an activity-based model calibrated for two full-scale prototype cities, consisting of representative synthetic populations and mobility networks for two contrasting auto-dependent city typologies. We simulate the propagation of the COVID-19 epidemic in both cities to analyze spreading patterns in urban networks across various activity types. Investigating the impact of the transit network, we find that its removal dampens disease propagation significantly, suggesting that transit restriction is more critical for mitigating post-peak disease spreading in transit dense cities. In …
Estimation Of Suspended Sediment Concentration From Remote Sensing And In Situ Measurement Over Lake Tana, Ethiopia, Zelalem R. Womber, Fasikaw A. Zimale, Mebrahtom G. Kebedew, Bekalu W. Asers, Nikole M. Deluca, Christian D. Guzman, Seifu A. Tilahun, Benjamin F. Zaitchik
Estimation Of Suspended Sediment Concentration From Remote Sensing And In Situ Measurement Over Lake Tana, Ethiopia, Zelalem R. Womber, Fasikaw A. Zimale, Mebrahtom G. Kebedew, Bekalu W. Asers, Nikole M. Deluca, Christian D. Guzman, Seifu A. Tilahun, Benjamin F. Zaitchik
Civil and Environmental Engineering Faculty Publication Series
Discharge from basins joining a lake is the main factor determining the lake volume and sediment inflow to the lake. Suspended sediment is an important parameter for describing the water quality of aquatic ecosystems. Lake Tana is an important and the largest lake in Ethiopia for the local ecological system. However, environmental change and anthropogenic activities in the area threaten its water quality. The conventional methods of suspended sediment concentration (SSC) observation are unable to determine and compare spatial and temporal SSC patterns for the lake over a period of years. Remote sensing methods have made it possible to map …
Hourly Surface Meltwater Routing For A Greenlandic Supraglacial Catchment Across Hillslopes And Through A Dense Topological Channel Network, Colin J. Gleason, Kang Yang, Dongmei Feng, Laurence C. Smith, Kai Liu, Lincoln H. Pitcher, Vena W. Chu, Matthew G. Cooper, Brandon T. Overstreet, Asa K. Rennermalm
Hourly Surface Meltwater Routing For A Greenlandic Supraglacial Catchment Across Hillslopes And Through A Dense Topological Channel Network, Colin J. Gleason, Kang Yang, Dongmei Feng, Laurence C. Smith, Kai Liu, Lincoln H. Pitcher, Vena W. Chu, Matthew G. Cooper, Brandon T. Overstreet, Asa K. Rennermalm
Civil and Environmental Engineering Faculty Publication Series
Recent work has identified complex perennial supraglacial stream and river networks in areas of the Greenland Ice Sheet (GrIS) ablation zone. Current surface mass balance (SMB) models appear to overestimate meltwater runoff in these networks compared to in-channel measurements of supraglacial discharge. Here, we constrain SMB models using the hillslope river routing model (HRR), a spatially explicit flow routing model used in terrestrial hydrology, in a 63 km(2) supraglacial river catchment in southwest Greenland. HRR conserves water mass and momentum and explicitly accounts for hillslope routing (i.e., flow over ice and/or firn on the GrIS), and we produce hourly flows …
In Vivo Evaluation Of Oxygenic Photogranules’ Photosynthetic Capacity By Pulse Amplitude Modulation And Phototrophic–Irradiance Curves, Joseph G. Gikonyo, Andrew Keyser, John Tobiason, Jeeyon Jeong, Chul Park
In Vivo Evaluation Of Oxygenic Photogranules’ Photosynthetic Capacity By Pulse Amplitude Modulation And Phototrophic–Irradiance Curves, Joseph G. Gikonyo, Andrew Keyser, John Tobiason, Jeeyon Jeong, Chul Park
Civil and Environmental Engineering Faculty Publication Series
The commingled microbial moiety of oxygenic photogranules (OPGs) facilitates aeration-free wastewater treatment. Embedded in an extracellular polymeric substances (EPS) matrix, microbial producers and consumers of oxygen occupying granular niches exchange substrates among themselves and with the bulk fluid. An assessment of the OPG's phototrophic potential or functional capacity may require combining different photoactivity signals. The photosynthetic capacity was evaluated using photosynthetic oxygen evolution (POE) and chlorophyll fluorescence (rapid light curves, RLC) measurements using OPGs grown at different light intensities.. A maximum oxygen generating capacity for optimal OPGs and reactor conditions was determined to be 284.4 mgO(2) gVSS(-1) h(-1) The OPGs …
On The Measurements Of Individual Particle Properties Via Compression And Crushing, Chunlong Liu, Fengyin Liu, Jinliang Song, Fuli Ma, Dongfang Wang, Guoping Zhang
On The Measurements Of Individual Particle Properties Via Compression And Crushing, Chunlong Liu, Fengyin Liu, Jinliang Song, Fuli Ma, Dongfang Wang, Guoping Zhang
Civil and Environmental Engineering Faculty Publication Series
An experimental study is presented to measure the elastic, yielding, and crushing properties of individual particles under compression using substrates made of aluminum alloy, stainless steel, and sapphire. Carefully selected, highly spherical individual Ottawa sand particles of 0.75-1.1 mm in nominal diameter were compressed between two smooth substrates, and the load-deformation curves were analyzed by Hertz elastic contact theory to derive their reduced modulus and Young's modulus as well as yielding and crushing strengths, which vary significantly with the type of substrate materials. Further analysis of the yielding and plastic deformation at the particle-substrate contact shows that the yield strength …
Impacts Of Global Warming Of 1.5, 2.0 And 3.0 °C On Hydrologic Regimes In The Northeastern U.S., Ridwan Siddique, Alfonso Mejia, Naoki Mizukami, Richard N. Palmer
Impacts Of Global Warming Of 1.5, 2.0 And 3.0 °C On Hydrologic Regimes In The Northeastern U.S., Ridwan Siddique, Alfonso Mejia, Naoki Mizukami, Richard N. Palmer
Civil and Environmental Engineering Faculty Publication Series
Regional climate change impacts show a wide range of variations under different levels of global warming. Watersheds in the northeastern region of the United States (NEUS) are projected to undergo the most severe impacts from climate change in the forms of extreme precipitation events, floods and drought, sea level rise, etc. As such, there is high possibility that hydrologic regimes in the NEUS may be altered in the future, which can be absolutely devastating for managing water resources and ecological balance across different watersheds. In this study, we present a comprehensive impact analysis using different hydrologic indicators across selected watersheds …
Wastewater Surveillance For Sars-Cov-2 On College Campuses: Initial Efforts, Lessons Learned, And Research Needs, Sasha Harris-Lovett, Kara L. Nelson, Paloma Beamer, Heather N. Bischel, Aaron Bivins, Andrea Bruder, Caitlyn Butler, Todd. D. Camenisch, Susan K. De Long, Smruthi Karthikeyan, David A. Larsen, Katherine Meierdiercks, Paula J. Mouser, Sheree Pagsuyoin, Sarah M. Prasek, Tyler S. Radniecki, Jeffrey L. Ram, D. Keith Roper, Hannah Safford, Samendra P. Sherchan, William Shuster, Thibault Stalder, Robert T. Wheeler, Katrina Smith Korfmacher
Wastewater Surveillance For Sars-Cov-2 On College Campuses: Initial Efforts, Lessons Learned, And Research Needs, Sasha Harris-Lovett, Kara L. Nelson, Paloma Beamer, Heather N. Bischel, Aaron Bivins, Andrea Bruder, Caitlyn Butler, Todd. D. Camenisch, Susan K. De Long, Smruthi Karthikeyan, David A. Larsen, Katherine Meierdiercks, Paula J. Mouser, Sheree Pagsuyoin, Sarah M. Prasek, Tyler S. Radniecki, Jeffrey L. Ram, D. Keith Roper, Hannah Safford, Samendra P. Sherchan, William Shuster, Thibault Stalder, Robert T. Wheeler, Katrina Smith Korfmacher
Civil and Environmental Engineering Faculty Publication Series
Wastewater surveillance for the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is an emerging approach to help identify the risk of a coronavirus disease (COVID-19) outbreak. This tool can contribute to public health surveillance at both community (wastewater treatment system) and institutional (e.g., colleges, prisons, and nursing homes) scales. This paper explores the successes, challenges, and lessons learned from initial wastewater surveillance efforts at colleges and university systems to inform future research, development and implementation. We present the experiences of 25 college and university systems in the United States that monitored campus wastewater for SARS-CoV-2 during the fall 2020 academic …
Predicting Flood Insurance Claims With Hydrologic And Socioeconomic Demographics Via Machine Learning: Exploring The Roles Of Topography, Minority Populations, And Political Dissimilarity, James Knighton, Brian Buchanan, Christian Guzman, Rebecca Elliott, Eric White, Brian Rahm
Predicting Flood Insurance Claims With Hydrologic And Socioeconomic Demographics Via Machine Learning: Exploring The Roles Of Topography, Minority Populations, And Political Dissimilarity, James Knighton, Brian Buchanan, Christian Guzman, Rebecca Elliott, Eric White, Brian Rahm
Civil and Environmental Engineering Faculty Publication Series
Current research on flooding risk often focuses on understanding hazards, de-emphasizing the complex pathways of exposure and vulnerability. We investigated the use of both hydrologic and social demographic data for flood exposure mapping with Random Forest (RF) regression and classification algorithms trained to predict both parcel- and tract-level flood insurance claims within New York State, US. Topographic characteristics best described flood claim frequency, but RF prediction skill was improved at both spatial scales when socioeconomic data was incorporated. Substantial improvements occurred at the tract-level when the percentage of minority residents, housing stock value and age, and the political dissimilarity index …
Remote Sensing Of River Discharge: A Review And A Framing For The Discipline, Colin J. Gleason, Michael T. Durand
Remote Sensing Of River Discharge: A Review And A Framing For The Discipline, Colin J. Gleason, Michael T. Durand
Civil and Environmental Engineering Faculty Publication Series
Remote sensing of river discharge (RSQ) is a burgeoning field rife with innovation. This innovation has resulted in a highly non-cohesive subfield of hydrology advancing at a rapid pace, and as a result misconceptions, mis-citations, and confusion are apparent among authors, readers, editors, and reviewers. While the intellectually diverse subfield of RSQ practitioners can parse this confusion, the broader hydrology community views RSQ as a monolith and such confusion can be damaging. RSQ has not been comprehensively summarized over the past decade, and we believe that a summary of the recent literature has a potential to provide clarity to practitioners …
Packing Potential Index For Binary Mixtures Of Granular Soil, Ching S. Chang, Yibing Deng
Packing Potential Index For Binary Mixtures Of Granular Soil, Ching S. Chang, Yibing Deng
Civil and Environmental Engineering Faculty Publication Series
Packing procedure is the mechanical process of forming a packing of soil particles, such as funnel pouring, tamping, rodding, pluviation, compaction, vibration, compression, etc. For a sand-silt mixture, packing procedure and particle shape have significant effects on the density of the binary mixture. However, these two factors have not been considered in most of the existing particle packing density models. Thus, the existing particle packing density models are not applicable to sand-silt mixtures. In this paper, we aim to study the packing procedure and particle shape effects on density of binary mixtures. We firstly define a packing potential index, which …
Multi-Temporal Scale Analysis Of Complementarity Between Hydro And Solar Power Along An Alpine Transect, T. Pérez Ciria, H. D. Puspitarini, G. Chiogna, B. François, M. Borga
Multi-Temporal Scale Analysis Of Complementarity Between Hydro And Solar Power Along An Alpine Transect, T. Pérez Ciria, H. D. Puspitarini, G. Chiogna, B. François, M. Borga
Civil and Environmental Engineering Faculty Publication Series
Variable renewable energy sources display different space-time variability driving the availability of energy generated from these sources. Complementarity among variable renewable energies in time and space allows reducing the variability of power supply and helps matching the electricity demand curve. This work investigates the temporal structure of complementarity along an alpine transect in North-East Italy, considering a 100% renewable energy mix scenario composed by photovoltaic and run-of-the-river energy. We analyze the dominant scales of variability of variable renewable energy sources and electricity demand. In addition, we introduce a new metric, the wavelet-based complementarity index, to quantify the potential complementarity between …
Complementarity Between Combined Heat And Power Systems, Solar Pv And Hydropower At A District Level: Sensitivity To Climate Characteristics Along An Alpine Transect, Handriyanti Diah Puspitarini, Baptiste François, Marco Baratieri, Casey Brown, Mattia Zaramella, Marco Borga
Complementarity Between Combined Heat And Power Systems, Solar Pv And Hydropower At A District Level: Sensitivity To Climate Characteristics Along An Alpine Transect, Handriyanti Diah Puspitarini, Baptiste François, Marco Baratieri, Casey Brown, Mattia Zaramella, Marco Borga
Civil and Environmental Engineering Faculty Publication Series
Combined heat and power systems (CHP) produce heat and electricity simultaneously. Their resulting high efficiency makes them more attractive from the energy managers’ perspective than other conventional thermal systems. Although heat is a by-product of the electricity generation process, system operators usually operate CHP systems to satisfy heat demand. Electricity generation from CHP is thus driven by the heat demand, which follows the variability of seasonal temperature, and thus is not always correlated with the fluctuation of electricity demand. Consequently, from the perspective of the electricity grid operator, CHP systems can be seen as a non-controllable energy source similar to …
The Applicability Of Swot’S Non-Uniform Space–Time Sampling In Hydrologic Model Calibration, Cassandra Nickles, Edward Beighley, Dongmei Feng
The Applicability Of Swot’S Non-Uniform Space–Time Sampling In Hydrologic Model Calibration, Cassandra Nickles, Edward Beighley, Dongmei Feng
Civil and Environmental Engineering Faculty Publication Series
The Surface Water and Ocean Topography (SWOT) satellite mission, expected to launch in 2022, will enable near global river discharge estimation from surface water extents and elevations. However, SWOT’s orbit specifications provide non-uniform space–time sampling. Previous studies have demonstrated that SWOT’s unique spatiotemporal sampling has a minimal impact on derived discharge frequency distributions, baseflow magnitudes, and annual discharge characteristics. In this study, we aim to extend the analysis of SWOT’s added value in the context of hydrologic model calibration. We calibrate a hydrologic model using previously derived synthetic SWOT discharges across 39 gauges in the Ohio River Basin. Three discharge …
Antarctic Supraglacial Lake Identification Using Landsat-8 Image Classification, Anna Ruth W. Halberstadt, Colin J. Gleason, Mahsa S. Moussavi, Allen Pope, Luke D. Trusel
Antarctic Supraglacial Lake Identification Using Landsat-8 Image Classification, Anna Ruth W. Halberstadt, Colin J. Gleason, Mahsa S. Moussavi, Allen Pope, Luke D. Trusel
Civil and Environmental Engineering Faculty Publication Series
Surface meltwater generated on ice shelves fringing the Antarctic Ice Sheet can drive ice-shelf collapse, leading to ice sheet mass loss and contributing to global sea level rise. A quantitative assessment of supraglacial lake evolution is required to understand the influence of Antarctic surface meltwater on ice-sheet and ice-shelf stability. Cloud computing platforms have made the required remote sensing analysis computationally trivial, yet a careful evaluation of image processing techniques for pan-Antarctic lake mapping has yet to be performed. This work paves the way for automating lake identification at a continental scale throughout the satellite observational record via a thorough …
Changing River Flood Timing In The Northeastern And Upper Midwest United States: Weakening Of Seasonality Over Time?, Nirajan Dhakal, Richard N. Palmer
Changing River Flood Timing In The Northeastern And Upper Midwest United States: Weakening Of Seasonality Over Time?, Nirajan Dhakal, Richard N. Palmer
Civil and Environmental Engineering Faculty Publication Series
Climate change is likely to impact precipitation as well as snow accumulation and melt in the Northeastern and Upper Midwest United States, ultimately affecting the quantity and seasonal distribution of streamflow. The objective of this study is to analyze seasonality of long-term daily annual maximum streamflow (AMF) records and its changes for 158 sites in Northeastern and Upper Midwest Unites States. A comprehensive circular statistical approach comprising a kernel density method was used to assess the seasonality of AMF. Temporal changes were analyzed by separating the AMF records into two 30-year sub-periods (1951–1980 and 1981–2010). Results for temporal change in …
Rapid Mapping Of Small-Scale River-Floodplain Environments Using Uav Sfm Supports Classical Theory, Guy J.-P. Schumann, Joseph Muhlhausen, Konstantinos M. Andreadis
Rapid Mapping Of Small-Scale River-Floodplain Environments Using Uav Sfm Supports Classical Theory, Guy J.-P. Schumann, Joseph Muhlhausen, Konstantinos M. Andreadis
Civil and Environmental Engineering Faculty Publication Series
Unmanned Aerial Vehicle (UAV) platforms have rapidly developed as tools for remote mapping at very high spatial resolutions. They have recently gained in popularity in many application fields owing to the versatility of platforms and sensors, ease of deployment, and a steady increase in computational power. Obtaining highly detailed topography data over very small scales is one of the more typical application domains. Here, we demonstrate this application using Structure from Motion (SfM) processing over a small river floodplain in Howard County (Maryland, USA). Evaluation of the derived bare-earth terrain model with state-of-the art LiDAR shows a trivial bias of …
Simulation-Based Assessment Of Multilane Separate Freeways At Toll Station Area: A Case Study From Huludao Toll Station On Shenshan Freeway, Changyin Dong, Hao Wang, Quan Chen, Daiheng Ni, Ye Li
Simulation-Based Assessment Of Multilane Separate Freeways At Toll Station Area: A Case Study From Huludao Toll Station On Shenshan Freeway, Changyin Dong, Hao Wang, Quan Chen, Daiheng Ni, Ye Li
Civil and Environmental Engineering Faculty Publication Series
To support the rapid growth of demand in passengers and freight, separating trucks and passenger-cars is a potential solution to improve traffic efficiency and safety. The primary purpose of this paper is to comprehensively assess the multilane separate freeway at Huludao Toll Station in Liaoning Province, China. Based on the configuration and segmentation of the freeway near a toll station, a six-step guidance strategy is designed to adapt to the separate organization mode. Five conventional traffic scenarios are designed in the Vissim platform for comparative analysis between different guidance strategies. To investigate the vehicle-to-infrastructure (V2I) environment, a microscopic testbed is …
Climate, Land Use And Land Cover Changes In The Bandama Basin (Côte D’Ivoire, West Africa) And Incidences On Hydropower Production Of The Kossou Dam, Yao Morton Kouame, Salomon Obahoundje, Arona Diedhiou, Baptiste François, Ernest Amoussou, Sandrine Anquetin, Régis Sacre Didi, Lazare Kouakou Kouassi, Vami Hermann N'Guessan Bi, Emile Gneneyougo Soro, Etienne Kouakou Yao
Climate, Land Use And Land Cover Changes In The Bandama Basin (Côte D’Ivoire, West Africa) And Incidences On Hydropower Production Of The Kossou Dam, Yao Morton Kouame, Salomon Obahoundje, Arona Diedhiou, Baptiste François, Ernest Amoussou, Sandrine Anquetin, Régis Sacre Didi, Lazare Kouakou Kouassi, Vami Hermann N'Guessan Bi, Emile Gneneyougo Soro, Etienne Kouakou Yao
Civil and Environmental Engineering Faculty Publication Series
Climate and land use/cover changes are potential drivers of change in hydrology and water use. Incidences of these factors on Bandama hydrological basin and Kossou hydropower generation (1981–2016) in West Africa are assessed in this present work. Using Landsat products of United Stated Geological Survey, results show that water bodies areas and land use have increased by 1.89%/year and 11.56%/year respectively, whereas herbaceous savanna, savanna, forest and evergreen forest coverage have been reduced by 1.39%/year, 0.02%/year, 2.39%/year and 3.33%/year respectively from 1988 to 2016. Hydroclimatic analysis reveals that streamflow presents greater change in magnitude compared to rainfall though both increasing …
A High-Resolution Airborne Color-Infrared Camera Water Mask For The Nasa Above Campaign, Ethan D. Kyzivat, Laurence C. Smith, Lincoln H. Pitcher, Jessica V. Fayne, Sarah W. Cooley, Matthew G. Cooper, Simon N. Topp, Theodore Langhorst, Merritt E. Harlan, Christopher Horvat, Colin J. Gleason, Tamlin M. Pavelsky
A High-Resolution Airborne Color-Infrared Camera Water Mask For The Nasa Above Campaign, Ethan D. Kyzivat, Laurence C. Smith, Lincoln H. Pitcher, Jessica V. Fayne, Sarah W. Cooley, Matthew G. Cooper, Simon N. Topp, Theodore Langhorst, Merritt E. Harlan, Christopher Horvat, Colin J. Gleason, Tamlin M. Pavelsky
Civil and Environmental Engineering Faculty Publication Series
The airborne AirSWOT instrument suite, consisting of an interferometric Ka-band synthetic aperture radar and color-infrared (CIR) camera, was deployed to northern North America in July and August 2017 as part of the NASA Arctic-Boreal Vulnerability Experiment (ABoVE). We present validated, open (i.e., vegetation-free) surface water masks produced from high-resolution (1 m), co-registered AirSWOT CIR imagery using a semi-automated, object-based water classification. The imagery and resulting high-resolution water masks are available as open-access datasets and support interpretation of AirSWOT radar and other coincident ABoVE image products, including LVIS, UAVSAR, AIRMOSS, AVIRIS-NG, and CFIS. These synergies offer promising potential for multi-sensor analysis …