Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons

Open Access. Powered by Scholars. Published by Universities.®

2014 International Conference on Hydroinformatics HIC

Articles 1 - 30 of 465

Full-Text Articles in Physical Sciences and Mathematics

Odm Tools Python: Open Source Software For Managing Continuous Sensor Data, Jeffery S. Horsburgh, Stephanie Reeder, Amber Spackman Jones Oct 2016

Odm Tools Python: Open Source Software For Managing Continuous Sensor Data, Jeffery S. Horsburgh, Stephanie Reeder, Amber Spackman Jones

Stephanie Reeder

Hydrologic and water quality data is being collected at high frequencies, for extended durations, and with spatial distributions that require infrastructure for data storage and management. The Observations Data Model (ODM), which is part of the Consortium of Universities for the Advancement of Hydrologic Science, Inc. (CUAHSI) Hydrologic Information System (HIS), was developed as a framework in which to organize, store, and describe point observations data. In this paper we describe ODM Tools Python, which is an open source software application that allows ODM users to query and export, visualize, and edit data stored in an ODM database. Previous versions ...


A Tool For Automatic Estimation Of The Stage Height For Ungauged River Sites, Hojun You, Dongsu Kim, Yongwon Seo, Il Won Seo Aug 2014

A Tool For Automatic Estimation Of The Stage Height For Ungauged River Sites, Hojun You, Dongsu Kim, Yongwon Seo, Il Won Seo

International Conference on Hydroinformatics

Recently, River Information Systems that integrate a variety of riverine information have been widely developed, driven by information technologies. The present study attempts to develop a software called HydroConnector that dynamically integrates river-based numerical modeling or post-processing with in situ data, based upon a data searching technique that uses a hydro web service built on top of an ODM-based database, following a CUAHSI standard. It fundamentally differs from the conventional direct access to the database for acquiring a given period of a dataset. Such a hydro web service and ODM-based database were built by utilizing existing real-time stream gaging data ...


Flood Risk From Extreme Events In Mexico, Adrián Pedrozo-Acuña, Pamela Iskra Mejía-Estrada, Juan Pablo Rodríguez-Rincón, Ramón Domínguez Mora, Fernando Jorge González-Villareal Aug 2014

Flood Risk From Extreme Events In Mexico, Adrián Pedrozo-Acuña, Pamela Iskra Mejía-Estrada, Juan Pablo Rodríguez-Rincón, Ramón Domínguez Mora, Fernando Jorge González-Villareal

International Conference on Hydroinformatics

Flooding is the most common and damaging natural hazard faced by civilization, and flooding threats are likely to increase given current climate change predictions that suggest more intense hurricanes and precipitation. The latter has been recently experienced in the Mexican state of Guerrero, during the severe flood of September 2013. During this event, the heavy rainfall registered in 2 days (~700 mm) produced extreme river discharges that produced significant fluvial impacts and flooding in large areas of the city of Acapulco, causing severe damages and social disruption. In order to study the causes of this disaster, an integrated methodology to ...


Publishing And Federating Global Water Data And Maps Via Web Services, David K. Arctur, David R. Maidment Aug 2014

Publishing And Federating Global Water Data And Maps Via Web Services, David K. Arctur, David R. Maidment

International Conference on Hydroinformatics

Finding and accessing data in most countries of the world about local, regional and national water resources (streamflow discharge, gauge depth, soil moisture, etc.) has been complicated by a number of issues, from concerns of local and national security, to lack of suitable conventions and standards for data exchange that could be reasonably implemented and enforced at the national and international levels. These issues are now starting to be addressed, thanks to recently adopted standards for hydrologic data exchange, and growing acceptance of community standards for web services to perform such data exchange. This presentation reviews recent work in this ...


Accurate Prediction Of Ecological Quality Ratio With Product Unit Neural Networks, Arie De Niet, Erwin Meijers, Sebastiaan Schep Aug 2014

Accurate Prediction Of Ecological Quality Ratio With Product Unit Neural Networks, Arie De Niet, Erwin Meijers, Sebastiaan Schep

International Conference on Hydroinformatics

This paper shows how to use product unit neural networks (punn's) to derive a data-driven model for the prediction of ecological quality in surface water. In a comparison with other approaches the punns provide by far the best prediction. Moreover they reveal the underlying relations between characteristics and ecological quality. Encouraged by the European Water Framework Directive many measures are taken by Dutch government to improve water quality en ecological quality of surface water. Although it is well known which type of measures are most effective in what cases, it is uncertain what the total effect of a measure ...


Model Integration To Improve An Early Warning System For The Pollution Control Of The Cauca River, Colombia, Carlos Martínez-Cano, Alberto Galvis, Franco Alvis, Micha Werner Aug 2014

Model Integration To Improve An Early Warning System For The Pollution Control Of The Cauca River, Colombia, Carlos Martínez-Cano, Alberto Galvis, Franco Alvis, Micha Werner

International Conference on Hydroinformatics

One of the main problems in the water supply system in the city of Cali is related to the water quality of the Cauca River. An important source of pollution upstream of the intake of the Puerto Mallarino Treatment Plant (PMTP) is the south channel, part of the South Drainage System (SDS) which discharges into the Cauca River. The existing Early Warning System (EWS) prototype named EWS-Centinela aims to use the real-time data from the Milan station located in the Navarro area and data generated from the intake of PMTP. EWS-Centinela estimates the risk level of a critical pollution event ...


Development Of Water Pollution Early Warning System For Oyster Harvesting Areas, Zhiqiang Deng Aug 2014

Development Of Water Pollution Early Warning System For Oyster Harvesting Areas, Zhiqiang Deng

International Conference on Hydroinformatics

The objective of this study is to develop a Pollution Early Warning System (PEWS) for efficient management of water quality in oyster harvesting areas. To that end, this paper presents a web-enabled, user-friendly PEWS for managing water quality in oyster harvesting areas along Louisiana Gulf Coast, USA. The PEWS consists of (1) an Integrated Space-Ground Sensing System (ISGSS) gathering data for environmental factors influencing water quality, (2) an Artificial Neural Network (ANN) model for predicting the level of fecal coliform bacteria, and (3) a web-enabled, user-friendly Geographic Information System (GIS) platform for issuing water pollution advisories and managing oyster harvesting ...


Automated Event Management And Integration Of Scada With Gis And Cmms: Project Insygnia, Francisco Javier Fernandez, Elias Manrique Aug 2014

Automated Event Management And Integration Of Scada With Gis And Cmms: Project Insygnia, Francisco Javier Fernandez, Elias Manrique

International Conference on Hydroinformatics

Canal de Isabel II Gestión S.A. (henceforth, Canal Gestión) is a public corporation that deals with the full water cycle in the region of Madrid, Spain. It provides service to more than 6.3 million people, in an area of about 8000 sq. km. Its supply and sewage system is quite complex, and its operation requires sophisticated ITC systems. One in particular, the centralised SCADA, captures data from nearly 50000 instruments. This information generates an average of about 3000 alarms a day, which are treated in its Main Control Centre. In order to make a better management of these ...


Modularity Index For The Segmentation Of Water Distribution Networks, Orazio Giustolisi, Luca Ridolfi Aug 2014

Modularity Index For The Segmentation Of Water Distribution Networks, Orazio Giustolisi, Luca Ridolfi

International Conference on Hydroinformatics

The search for suitable segmentations is a challenging issue for analysis, planning and management of water distribution networks (WDNs). In fact complex and large size hydraulic systems require the division into modules in order to simplify the analysis and the management tasks. In complex network theory, modularity index was proposed as a measure of the strength of the network division into communities. Nevertheless, modularity index needs to be revised considering the specificity of the hydraulic systems. Accordingly, the classic modularity index is firstly presented and, then, tailored and modified for WDNs. Furthermore, a multi-objective strategy for optimal segmentation is presented ...


Comparison Of 2d Numerical Schemes For Modelling Supercritical And Transcritical Flows Along Urban Floodplains, Yared Abayneh Abebe, Solomon D. Seyoum, Zoran Vojinović, Roland K. Price Aug 2014

Comparison Of 2d Numerical Schemes For Modelling Supercritical And Transcritical Flows Along Urban Floodplains, Yared Abayneh Abebe, Solomon D. Seyoum, Zoran Vojinović, Roland K. Price

International Conference on Hydroinformatics

Urban floodplains usually have irregular geometry due to different obstacles, urban infrastructures and slope conditions. This may change the flow regime from subcritical to supercritical flow conditions, and vice versa. Implementation of the full momentum equation in 2D shallow water equations (SWEs) is not trivial in mixed flow conditions as subcritical and supercritical flows require different boundary conditions and hence different solution algorithms. Some models ignore the convective acceleration term (CAT) to simplify implementation of the momentum equation for mixed flow conditions. This work tried to investigate the effect of neglecting CATs by testing two 2D models which implement - full ...


A Comparison Between Heuristic, Statistical, And Data-Driven Methods In Landslide Susceptibility Assessment: An Application To The Briga And Giampilieri Catchments, Antonio Francipane, Elisa Arnone, Francesco Lo Conti, Claudio Puglisi, Leonardo Valerio Noto Aug 2014

A Comparison Between Heuristic, Statistical, And Data-Driven Methods In Landslide Susceptibility Assessment: An Application To The Briga And Giampilieri Catchments, Antonio Francipane, Elisa Arnone, Francesco Lo Conti, Claudio Puglisi, Leonardo Valerio Noto

International Conference on Hydroinformatics

Susceptibility assessment concerning the estimation of areas prone to landslide is one of the most useful approach in the analysis of landslide hazard. Over the last years, in an attempt to find the best approach to evaluate landslide susceptibility, many methods have been developed. Among these, the heuristic, the statistical, and the data-driven approaches are very widespread, and they all are based on the concept that the conditions which led to landslide movements in the past will control the probability of movement occurrence in the future. The main disadvantage of the heuristic approach is its high level of subjectivity, since ...


Thermoclinic Assessment Of A Preliminary Circulation Model For Lake George In The Jefferson Project, Emanuele Ragnoli, Fearghal O Donncha, Jeffrey W. Short, Imad A. Hannoun, Sandra A. Nierzwicki-Bauer, Lloyd A. Treinish, Anthony P. Priano, Charles W. Boylen Aug 2014

Thermoclinic Assessment Of A Preliminary Circulation Model For Lake George In The Jefferson Project, Emanuele Ragnoli, Fearghal O Donncha, Jeffrey W. Short, Imad A. Hannoun, Sandra A. Nierzwicki-Bauer, Lloyd A. Treinish, Anthony P. Priano, Charles W. Boylen

International Conference on Hydroinformatics

The Jefferson Project is a collaboration between the Rensselaer Polytechnic Institute, IBM, and the FUND for Lake George aimed at understanding and managing complex factors (road salt, storm water runoff, invasive species) threatening Lake George, New York.

Lake George is located about 80 km north of Albany in upstate New York and is known internationally for its water clarity. Understanding the hydrodynamics of the lake is fundamental for creation and maintenance of a research and monitoring program for the early detection of and response to adverse environmental and biological change. In this work a 3D circulation model of the lake ...


Wdnetxl: Efficient Research Transfer For Management, Planning And Design Of Water Distribution Networks, Daniele Laucelli, Luigi Berardi, Orazio Giustolisi Aug 2014

Wdnetxl: Efficient Research Transfer For Management, Planning And Design Of Water Distribution Networks, Daniele Laucelli, Luigi Berardi, Orazio Giustolisi

International Conference on Hydroinformatics

The WDNetXL system (www.hydroinformatics.it) is aimed at promoting transfer of research achievements in water distribution network (WDN) analysis, planning and management to practitioners, students and researchers. In order to facilitate the technology transfer, the WDNetXL functions are integrated into the worldwide known MS-Excel data-management environment. Advanced hydraulic modeling and topological analyses of WDN are combined with efficient optimization strategies to make readily available the latest, even customized, decision support tools for planning and management of WDNs. All these features make WDNetXL of practical support for technicians as well as a privileged platform to test innovations coming from research ...


Gap Filling Based On A Quantile Perturbation Factor Technique, Diego E. Mora, Guido Wyseure, Patrick Willems Aug 2014

Gap Filling Based On A Quantile Perturbation Factor Technique, Diego E. Mora, Guido Wyseure, Patrick Willems

International Conference on Hydroinformatics

The presence of hydro-meteorological series gaps is a common problem in hydrological and water engineering applications. This is also the case for the Ecuadorian hydrological data-series, showing many gaps of short term duration. This study focuses on the Paute River Basin, in the Southern Ecuadorian Andes. It is one of the most monitored basins in Ecuador, with 25 rainfall observed sites during the period 1963 - 1990. These series suffer of about 20% of missing data. Two techniques were evaluated comparing their efficiency in the filling of missing gaps. The first one is a traditional one based on multiple linear regressions ...


A Hybrid Optimization Method For Real-Time Pump-Scheduling, Valeria Puleo, Mark Morley, Gabriele Freni, Dragan A. Savić Aug 2014

A Hybrid Optimization Method For Real-Time Pump-Scheduling, Valeria Puleo, Mark Morley, Gabriele Freni, Dragan A. Savić

International Conference on Hydroinformatics

Linear, non-linear and dynamic programming, heuristics and evolutionary computation are amongst the techniques which have been applied to obtain solutions to optimal pump-scheduling problems. Most of these either greatly simplify the complex water distribution system or require significant time to solve the problem. The scheduling of pumps is frequently undertaken in near-real time, in order to minimize cost and maximize energy savings. However, this requires a computationally efficient algorithm that can rapidly identify an acceptable solution. In this paper, a hybrid optimization model is presented, coupling Linear Programming and Genetic Algorithms. The resulting hybrid optimization model has demonstrated more rapid ...


Distribution Of Hydrological Losses For Varying Rainfall And Antecedent Wetness Conditions, Sithara H P Walpita Gamage, Guna Hewa, Simon Beecham Aug 2014

Distribution Of Hydrological Losses For Varying Rainfall And Antecedent Wetness Conditions, Sithara H P Walpita Gamage, Guna Hewa, Simon Beecham

International Conference on Hydroinformatics

Hydrological loss is a vital component in many hydrological models, which are usedin forecasting floods and evaluating water resources for both surface and subsurface flows. Due to the complex and random nature of the rainfall runoff process, hydrological losses are not yet fully understood. Consequently, practitioners often use representative values of the losses for design applications such as rainfall-runoff modelling which has led to inaccurate quantification of water quantities in the resulting applications. The existing hydrological loss models must be revisited and modellers should be encouraged to utilise other available data sets. This study is based on three unregulated catchments ...


Simulation Of Non-Point Source Pollution In Zhang River Basin, Xiaojuan Lin, Jinhui Huang Aug 2014

Simulation Of Non-Point Source Pollution In Zhang River Basin, Xiaojuan Lin, Jinhui Huang

International Conference on Hydroinformatics

Since 1987, the China Government started the “The Water Resource Protection and Management of Haihe River Basin” program aimed at tackling the problem of water pollution and realizing the comprehensive control of the ecosystem and water resources in the whole basin. This study aims to model one of the program’s catchments – Zhang River Basin (ZRB), which is a typical area with the striking water scarcity and water quality deterioration in Haihe River Basin (HRB). The distributed hydrological model SWAT(Soil and Water Assessment Tool) was used to simulate all related processes affecting water quantity, sediment, and nutrient loads in ...


Combining Satellite And Gauge Precipitation Data With Co-Kriging Method For Jakarta Region, Chi Dung Doan, Jiandong Liu, Shie-Yui Liong, Dong Eon Kim, Richard Sanders, Timothy Fewtrell Aug 2014

Combining Satellite And Gauge Precipitation Data With Co-Kriging Method For Jakarta Region, Chi Dung Doan, Jiandong Liu, Shie-Yui Liong, Dong Eon Kim, Richard Sanders, Timothy Fewtrell

International Conference on Hydroinformatics

Jakarta is vulnerable to flooding mainly caused by prolonged and heavy rainfall and thus a robust hydrological modeling is called for. A good quality of spatial precipitation data is therefore desired so that a good hydrological model could be achieved. Two types of rainfall sources are available: satellite and gauge station observations. At-site rainfall is considered to be a reliable and accurate source of rainfall. However, the limited number of stations makes the spatial interpolation not very much appealing. On the other hand, the gridded rainfall nowadays has high spatial resolution and improved accuracy, but still, relatively less accurate than ...


Ndvi With Artificial Neural Networks For Srtm Elevation Model Improvement – Hydrological Model Application, Dadiyorto Wendi, Yabin Sun, Chi Dung Doan, Shie-Yui Liong, Richard Sanders, Timothy Fewtrell Aug 2014

Ndvi With Artificial Neural Networks For Srtm Elevation Model Improvement – Hydrological Model Application, Dadiyorto Wendi, Yabin Sun, Chi Dung Doan, Shie-Yui Liong, Richard Sanders, Timothy Fewtrell

International Conference on Hydroinformatics

Digital elevation model (DEM) plays a substantial role in hydrological study, from understanding the catchment characteristics, setting up a hydrological model to mapping the flood risk in the region. Depending on the nature of study and its objectives, high resolution and reliable DEM is often desired to set up a sound hydrological model. However, such source of good DEM is not always available and it is generally high-priced. Obtained through radar based remote sensing, Shuttle Radar Topography Mission (SRTM) is a publicly available DEM with resolution of 92m outside US. It is a great source of DEM where no surveyed ...


Data Mining For Design Flood Prediction, James E. Ball Aug 2014

Data Mining For Design Flood Prediction, James E. Ball

International Conference on Hydroinformatics

Design flood estimation remains a problem for many professionals involved in the management of rural and urban catchments. Advice is required regarding design flood characteristics for many design problems including the design of culverts and bridges necessary for cross drainage of transport routes, the design of urban drainage systems, the design of flood mitigation levees and other flood mitigation structures, design of dam spillways, and many environmental flow problems. When a risk based approach is adopted as the design paradigm, there is a need to predict both the magnitude of the hazard and the exceedance probability of the hazard. In ...


Improving Sediment Transport Modelling By A Combination Of Field Data And Sensitivity Analysis, Tom Vanwalleghem, Juan Pablo Garcia, Juan Vicente Giráldez Aug 2014

Improving Sediment Transport Modelling By A Combination Of Field Data And Sensitivity Analysis, Tom Vanwalleghem, Juan Pablo Garcia, Juan Vicente Giráldez

International Conference on Hydroinformatics

Traditionally, the relationship between flow rate and sediment concentration in rivers has been estimated empirically. However, the problem of empirical data collection is that it is often difficult to cover the entire range of flow rates. Especially higher flow rates are often undersampled, which might lead to an underestimation of modelled sediment transport as flood events are often associated with important erosion events. In order to overcome this limitation, the introduction of the transport capacity concept can establish a safe upper bound of this sediment transport relationship. Nevertheless, given the number of implied variables in this equation, there is a ...


Enhancing Water Quality Data Service Discovery And Access Using Standard Vocabularies, Jonathan Yu, Bruce A. Simons, Nicholas J. Car, Simon J.D. Cox Aug 2014

Enhancing Water Quality Data Service Discovery And Access Using Standard Vocabularies, Jonathan Yu, Bruce A. Simons, Nicholas J. Car, Simon J.D. Cox

International Conference on Hydroinformatics

There is a growing need for consistency across the publishing, discovering, integrating and access to scientific datasets, such as water quality data. Such datasets may have varying formats and service interfaces. The Network Common Data Form (NetCDF) is both a software package and a data format for producing array-oriented scientific data, which is commonly used to exchange data, including water quality data. NetCDF datasets are also published through service interfaces using the THREDDS data server. Alternatively water quality datasets can be encoded with standard XML formats such as WaterML 2.0, which can be published with services such as the ...


Method Of Use And The Contribution Of Les 3d Modeling To Reproduce Velocity Distribution In Compound Channels, Salma Bellahcen, José Vazquez, Matthieu Dufresne, Robert Mose, Gilles Isenmann Aug 2014

Method Of Use And The Contribution Of Les 3d Modeling To Reproduce Velocity Distribution In Compound Channels, Salma Bellahcen, José Vazquez, Matthieu Dufresne, Robert Mose, Gilles Isenmann

International Conference on Hydroinformatics

Discharge determination in open channels is of great interest for water engineering, especially in compound channels where the main difficulty is the link between the measured velocity and the mean velocity. To do so, the 3D modeling is used as a tool to get the velocity distribution in compound channels. The purpose of this study is to compare through numerical simulations, the most common turbulence models such as K-epsilon and RSM to LES that is rarely used in this field, in order to show the efficiency of the LES model to reproduce the velocity distribution. The method used is the ...


Modelling And Validation Of The Santa Catarina Island Bays Hydrodynamics Based On Astronomic Tides And Measured Tides, Luis Hamilton Pospissil Garbossa, Argeu Vanz, Luis Daniel Fachada Fernandes, Robson Ventura De Souza, Luiz Fernando Vianna, Guilherme Sabino Rupp Aug 2014

Modelling And Validation Of The Santa Catarina Island Bays Hydrodynamics Based On Astronomic Tides And Measured Tides, Luis Hamilton Pospissil Garbossa, Argeu Vanz, Luis Daniel Fachada Fernandes, Robson Ventura De Souza, Luiz Fernando Vianna, Guilherme Sabino Rupp

International Conference on Hydroinformatics

Santa Catarina Island bays (SCI bays) has a great economic and social importance in the region. With more than 700.000 habitants in its surroundings, besides touristic and fishery activities, it represents approximately 70% of the Brazilian bivalve shellfish production. In order to understand processes controlling the water quality and food availability, relevant for the shellfish production, it is unquestionably important to understand the main hydrodynamics patterns of SCI Bay. Thus, a hydrodynamic assessment study of the SCI bays was carried out using the numerical model MOHID. The model was implemented using bathymetric information obtained from Brazilian nautical charts, two ...


Modflow: An Insight Into Thirty Years Development Of A Standard Numerical Code For Groundwater Simulations, Dalila Loudyi, Roger Falconer, Binliang Lin Aug 2014

Modflow: An Insight Into Thirty Years Development Of A Standard Numerical Code For Groundwater Simulations, Dalila Loudyi, Roger Falconer, Binliang Lin

International Conference on Hydroinformatics

Of all of the groundwater flow models widely available, the U.S. Geological Survey three-dimensional modular finite-difference, groundwater flow model, MODFLOW, is regarded by many as the most widely used by government agencies and consultancy firms. The Model was first developed in 1984 and since then many changes, updates and corrections have been introduced to the programme, simultaneously with its growing use. Since its establishment as a world-wide standard for groundwater flow modelling, many programmes have been developed to link MODFLOW to other codes that use groundwater flow information in porous saturated media. Processes such as solute transport, variable density ...


Development Of A Cloud Computing Application For Water Resources Modelling And Optimization Based On Open Source Software, Blagoj Delipetrev, Andreja Jonoski, Dimitri P. Solomatine Aug 2014

Development Of A Cloud Computing Application For Water Resources Modelling And Optimization Based On Open Source Software, Blagoj Delipetrev, Andreja Jonoski, Dimitri P. Solomatine

International Conference on Hydroinformatics

Cloud computing is the latest advancement in Information and Communication Technology (ICT) that provides computing as a service or delivers computation, software, data access, storage service without end-user knowledge of the physical location and system configuration. Cloud computing, service oriented architecture and web geographic information systems are new technologies for development of the cloud computing application for water resources modelling and optimization. The cloud application is deployed and tested in a distributed computer environment running on three virtual machines (VMs). The cloud application has five web services for: (1) spatial data infrastructure – 1 (SDI), (2) SDI – 2, (3) support for ...


A Particle Dispersion Model For Analysis Of Two-Dimensional Mixing In Open Channels, Il Won Seo, In Hwan Park Aug 2014

A Particle Dispersion Model For Analysis Of Two-Dimensional Mixing In Open Channels, Il Won Seo, In Hwan Park

International Conference on Hydroinformatics

Pollutant mixing in natural rivers is analyzed by using the two-dimensional depth-averaged advection-dispersion model (2D ADE) for rapid completion of the vertical mixing. The dispersion term in the 2D ADE follows Taylor’s assumption (Taylor, 1954; Fischer et al., 1979) which can be applied in the Taylor period. However, most open channel flow has long initial period which makes the skewed concentration distribution due to the unbalance between the shear flow advection and the vertical mixing (Chatwin, 1970). Therefore, the non-Fickian dispersion model is necessary to compensate the limitations of the 2D ADE model. In this research, the two-dimensional particle ...


Separation Of Soil Evaporation And Vegetation Transpiration By Modis Data For Central And Northern China, Tingting Li, Jinhui Jeanne Huang Aug 2014

Separation Of Soil Evaporation And Vegetation Transpiration By Modis Data For Central And Northern China, Tingting Li, Jinhui Jeanne Huang

International Conference on Hydroinformatics

Evapotranspiration(ET) plays a crucial role in the hydrologic system. To estimate evapotranspiration quantitatively in a large scale, remote sensing data has been used in a number of models and shows its applicability in the estimation of evapotranspiration. In this paper, evapotranspiration for central and northern China was derived from MODIS data. In arid and semi-arid regions, soil evaporation can be considered as the minimum water requirement for bare area, while evapotranspiration can be considered as the minimum water demand for the area covered by vegetation. Hence the separation of soil evaporation and vegetation transpiration is valuable for efficient water ...


Parameterization Of Turbulence Models Using 3dvar Data Assimilation, Agnieszka Indiana Olbert, Stephen Nash, Emanuele Ragnoli, Michael Hartnett Aug 2014

Parameterization Of Turbulence Models Using 3dvar Data Assimilation, Agnieszka Indiana Olbert, Stephen Nash, Emanuele Ragnoli, Michael Hartnett

International Conference on Hydroinformatics

In this research the 3DVAR data assimilation scheme is implemented in the numerical model DIVAST in order to optimize the performance of the numerical model by selecting an appropriate turbulence scheme and tuning its parameters. Two turbulence closure schemes: the Prandtl mixing length model and the two-equation k-ε model were incorporated into DIVAST and examined with respect to their universality of application, complexity of solutions, computational efficiency and numerical stability. A square harbour with one symmetrical entrance subject to tide-induced flows was selected to investigate the structure of turbulent flows. The experimental part of the research was conducted in a ...


A Serious Gaming Approach For Serious Stakeholder Participation, Chengzi Chew, Anna Zabel, Gareth James Lloyd, Indika Gunawardana, Bertram Monninkhoff Aug 2014

A Serious Gaming Approach For Serious Stakeholder Participation, Chengzi Chew, Anna Zabel, Gareth James Lloyd, Indika Gunawardana, Bertram Monninkhoff

International Conference on Hydroinformatics

Serious games are a category of games which are designed for a specific purpose other than for pure entertainment. It is not a new concept but serious games using real data, coupled with real time modelling and combining model results with social and economic factors opens up a new paradigm for active stakeholder participation. DHI and UNEP-DHI Centre initiated a project called Aqua Republica where a virtual world is developed which allows participants to develop a river basin and visualise the consequences of their decisions. The aim of this project is to raise awareness of the interconnectivity of water and ...