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Articles 331 - 360 of 1981

Full-Text Articles in Hydraulic Engineering

Hydraulic Balsa Wood Rising Bridge, Kaitlyn Greenfield Jan 2021

Hydraulic Balsa Wood Rising Bridge, Kaitlyn Greenfield

All Undergraduate Projects

What is the solution to allowing tall vessels to navigate past a vehicle bridge that is less than 10 [ft] above the water? To answer this question, a balsa wood bridge was designed, constructed, and tested. The bridge needed to articulate by mechanical means, allow for travel through the bridge, and be able to withstand ample force while the main structure only being constructed of balsa wood and glue. The project was analyzed in sections. These sections include: the bridge structure and its members, the hydraulic lift, and the pins needed for the bridge and hydraulic lift to operate. The …

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The Roles Of Groundwater Table In Catchment Hydrology, Lili Yao Jan 2021

The Roles Of Groundwater Table In Catchment Hydrology, Lili Yao

Electronic Theses and Dissertations, 2020-2023

The main goal of this dissertation research is to investigate catchment hydrological processes including infiltration and saturation excess runoff generation with consideration of groundwater table. For the infiltration process, an infiltration Péclet number was proposed to quantify the relative effects of gravity and capillary force on the evolution of infiltration capacity in the special case of the presence of a shallow water table, and a power law functional form of Time Compression Approximation was developed whose exponent was found to vary with the Péclet number. For the saturation excess runoff process, a new probability distribution model based on the SCS …

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A Study Of Geographic Information System-Based Watershed Processing For Hydrologic Analysis Of Ungauged Watersheds, Philip Adanbe Adalikwu Jan 2021

A Study Of Geographic Information System-Based Watershed Processing For Hydrologic Analysis Of Ungauged Watersheds, Philip Adanbe Adalikwu

Electronic Theses and Dissertations

The increasing application of geographic information system (GIS) technology in watershed modeling makes is necessary to further evaluate its impacts on runoff characteristics as a basis for improved hydrologic analysis in ungauged watersheds. Experts in the field of water resources and hydrology have recommended the practice of subdivision when modeling a watershed, and the use of observed data from hydrologically similar watershed to calibrate and validate an ungauged watershed’s model. However, previous studies have failed to adequately address the issues of watershed heterogeneity, spatial and temporal variability in physical parameters, GIS data resolution issues, including artifacts in automated extraction of …

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Laboratory Measurements Of Bed Shear Stress In Open Channel Flow And Soil Erosion Rate In Cohesive Soils, Gunnar Schurmann Kern Jan 2021

Laboratory Measurements Of Bed Shear Stress In Open Channel Flow And Soil Erosion Rate In Cohesive Soils, Gunnar Schurmann Kern

Electronic Theses and Dissertations

The relationship between soil erosion rate and bed shear stress is an important problem in sediment transport and scour. However, reliable measurements of the soil erosion function are challenging, both in the field and in the laboratory. The objective of this study is to investigate an experimental setup for conducting bed shear stress and soil erosion rate measurements using an open channel flume with a rough bed. These experiments were performed in an A-8 Hydraulic Channel with a fixed gravel bed. The flow discharge was kept constant at 0.158 ft.3/s, and bed shear stress was varied by changing the channel …

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A Hydrologic Climate Study For An Arid Region, Ali Alsubeai Jan 2021

A Hydrologic Climate Study For An Arid Region, Ali Alsubeai

Electronic Theses and Dissertations

Water is the most precious natural resource in arid regions due to the limitation of water resources, expanding population, and increasing volumes of industrial and domestic waste. The purpose of this research was to evaluate methods to estimate water quantity in an arid region. The research consisted of three separate studies. In the first study, hydrologic models used to estimate water quantity were evaluated for suitability of use in arid regions. Most hydrologic models that have been used in arid regions were originally developed for humid regions. Rainfall events in arid regions can be characterized as short-term, high intense rainstorms …

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Pesticide Occurrence And Persistence Entering Recreational Lakes In Watersheds Of Varying Land Uses, Jessica Satiroff, Tiffany Messer, Aaron R. Mittelstet, Daniel D. Snow Jan 2021

Pesticide Occurrence And Persistence Entering Recreational Lakes In Watersheds Of Varying Land Uses, Jessica Satiroff, Tiffany Messer, Aaron R. Mittelstet, Daniel D. Snow

Nebraska Water Center: Faculty Publications

Currently little is known of newer pesticide classes and their occurrence and persistence in recreational lakes. Therefore, the objectives of this study were to (1) assess average pesticide concentrations and loadings entering recreational lakes in three mixed land use watersheds throughout the growing season, (2) evaluate pesticide persistence longitudinally within the lakes, and (3) perform an ecotoxicity assessment. Six sampling campaigns were conducted at three lakes from April through October 2018 to measure the occurrence and persistence during pre, middle, and post growing season. Polar organic chemical integrative samplers (POCIS) were placed in streams near lake inlets and monthly samples …

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Occurrence Of Arsenite In Surface And Groundwater Associated With A Perennial Stream Located In Western Nebraska, Usa, Arindam Malakar, Rajesh Singh, Jeffrey Westrop, Karrie A. Weber, Christopher N. Elofson, Manish Kumar, Daniel D. Snow Jan 2021

Occurrence Of Arsenite In Surface And Groundwater Associated With A Perennial Stream Located In Western Nebraska, Usa, Arindam Malakar, Rajesh Singh, Jeffrey Westrop, Karrie A. Weber, Christopher N. Elofson, Manish Kumar, Daniel D. Snow

Nebraska Water Center: Faculty Publications

Dissolved arsenic typically results from chemical weathering of arsenic rich sediments and is most often found in oxidized forms in surface water. The mobility of arsenic is controlled by its valence state and also by its association with iron oxides minerals, the forms of which are both influenced by abiotic and biotic processes in aqueous environment. In this study, speciation methods were used to measure and confirm the presence of reduced arsenic species in the surface water of Frenchman creek, a gaining stream that crosses the Colorado- Nebraska border. Selective extraction analysis of aquifer and stream bed sediments shows that …

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Optimal Multi-Reservoir System Operations Under Inflow Scenarios In Nam Ngum River Basin, Lao Pdr, Bounhome Kimmany Jan 2021

Optimal Multi-Reservoir System Operations Under Inflow Scenarios In Nam Ngum River Basin, Lao Pdr, Bounhome Kimmany

Chulalongkorn University Theses and Dissertations (Chula ETD)

The Nam Ngum River is one of the main rivers in Lao PDR. Many hydropower projects are currently operated, under construction, and in the planning stage within the Nam Ngum River Basin (NNRB). These hydropower projects are managed by different organizations which could lead to conflict in operation and hinder the achievement of national developments. The main objective of this research is therefore to develop an optimization model for maximizing hydropower production in the NNRB through optimal reservoir operation under the impact of climate change. The potential consequence of maximizing hydropower production that could lead to flooding was also considered …

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Hydraulic Assessment Of Traditional And Fish-Friendly Tide Gates In Humboldt Bay, California, Marcela Anne Jimenez Jan 2021

Hydraulic Assessment Of Traditional And Fish-Friendly Tide Gates In Humboldt Bay, California, Marcela Anne Jimenez

Cal Poly Humboldt theses and projects

Tide gates are common hydraulic structures located throughout coastal and estuarine areas that prevent tidal waves from flooding previously converted tidally influenced areas. As restoration efforts increase, more “fish-friendly” tide gates that allow for larger openings and longer opening periods are being installed to improve habitat for threatened or endangered species. The purpose of this thesis was to determine discharge and head loss coefficients for traditional and side-hinged tide gates that could be inputs for hydraulic models and improve tide gate sizing and design. The study sites included Gannon Slough and US 101 Slough in Humboldt, California that represented a …

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Wave Climate Associated With Changing Water Level And Ice Cover In Lake Michigan, Chenfu Huang, Longhuan Zhu, Gangfeng Ma, Guy A. Meadows, Pengfei Xue Jan 2021

Wave Climate Associated With Changing Water Level And Ice Cover In Lake Michigan, Chenfu Huang, Longhuan Zhu, Gangfeng Ma, Guy A. Meadows, Pengfei Xue

Civil & Environmental Engineering Faculty Publications

Detailed knowledge of wave climate change is essential for understanding coastal geomorphological processes, ecosystem resilience, the design of offshore and coastal engineering structures and aquaculture systems. In Lake Michigan, the in-situ wave observations suitable for long-term analysis are limited to two offshore MetOcean buoys. Since this distribution is inadequate to fully represent spatial patterns of wave climate across the lake, a series of high-resolution SWAN model simulations were performed for the analysis of long-term wave climate change for the entirety of Lake Michigan from 1979 to 2020. Model results were validated against observations from two offshore buoys and 16 coastal …

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Reduction Of Energy Consumption Through Pump Efficiency Analysis, Riley Dodds Jan 2021

Reduction Of Energy Consumption Through Pump Efficiency Analysis, Riley Dodds

Williams Honors College, Honors Research Projects

Water scarcity, global warming, lack of fossil fuels, and future Green Act goals and legislature are at the forefront of policy change and election discussion within the United States. As civil engineers these topics are heavily discussed and challenged within the field and new solutions along with innovations are in constant demand. Within the community of Akron, the Akron Water Supply Water Plant continues to actively innovate and solve numerous concerns ranging from the quality of water to the overall operating costs. Energy consumption cost Akron Water Supply over $952,914.32 and 14,411,960 of kilowatts per hour of electrical energy to …

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Nanomaterials In The Environment, Human Exposure Pathway, And Health Effects: A Review, Arindam Malakar, Sushil R. Kanel, Chittaranjan Ray, Daniel D. Snow, Mallikarjuna N. Nadagouda Jan 2021

Nanomaterials In The Environment, Human Exposure Pathway, And Health Effects: A Review, Arindam Malakar, Sushil R. Kanel, Chittaranjan Ray, Daniel D. Snow, Mallikarjuna N. Nadagouda

Daugherty Water for Food Global Institute: Faculty Publications

Nanomaterials (NMs), both natural and synthetic, are produced, transformed, and exported into our environment daily. Natural NMs annual flux to the environment is around 97% of the total and is significantly higher than synthetic NMs. However, synthetic NMs are considered to have a detrimental effect on the environment. The extensive usage of synthetic NMs in different fields, including chemical, engineering, electronics, and medicine, makes them susceptible to be discharged into the atmosphere, various water sources, soil, and landfill waste. As ever-larger quantities of NMs end up in our environment and start interacting with the biota, it is crucial to understand …

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Baseflow Nitrate Dynamics Within Nested Watersheds Of An Agricultural Stream In Nebraska, Usa, Galen Richards, Troy E. Gilmore, Aaron R. Mittelstet, Tiffany Messer, Daniel D. Snow Jan 2021

Baseflow Nitrate Dynamics Within Nested Watersheds Of An Agricultural Stream In Nebraska, Usa, Galen Richards, Troy E. Gilmore, Aaron R. Mittelstet, Tiffany Messer, Daniel D. Snow

Daugherty Water for Food Global Institute: Faculty Publications

There is a need to evaluate high surface nitrate concentrations across agricultural watersheds, both spatially and temporally, to increase understanding of source and timing of nitrogen loads in streams and rivers. Bazile Creek is a high-nitrate stream originating in the agriculturally intensive Bazile Groundwater Management Area of Eastern Nebraska, USA. It is a gaining stream that receives groundwater with high nitrate concentrations originating from nonpoint sources. The objective of this study was to determine spatial and temporal variability of baseflow nitrate concentrations in Bazile Creek and its tributaries and to relate this variability to watershed characteristics. Surface-water nitrate samples were …

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Surveillance Of Plasticizers, Bisphenol A, Steroids And Caffeine In Surface Water Of River Ganga And Sundarban Wetland Along The Bay Of Bengal: Occurrence, Sources, Estrogenicity Screening And Ecotoxicological Risk Assessment, Paromita Chakraborty, Nancy W. Shappell, Moitraiyee Mukhopadhyay, Sathaporn Onanong, Daniel D. Snow Jan 2021

Surveillance Of Plasticizers, Bisphenol A, Steroids And Caffeine In Surface Water Of River Ganga And Sundarban Wetland Along The Bay Of Bengal: Occurrence, Sources, Estrogenicity Screening And Ecotoxicological Risk Assessment, Paromita Chakraborty, Nancy W. Shappell, Moitraiyee Mukhopadhyay, Sathaporn Onanong, Daniel D. Snow

Daugherty Water for Food Global Institute: Faculty Publications

The transboundary River Ganga serves as a conduit for meltwater from the Himalayas and is a major freshwater source for two thirds of Indian population before emptying into the Sundarban Delta, the largest estuary in the Bay of Bengal. Endocrine disrupting compounds (EDCs) such as phthalic acid esters (PAEs) and bisphenol A (BPA) used as organic plastic additives can pollute the aquatic environment receiving plastic litter. Hence, we have investigated these EDCs in water samples from Ganga and Sundarban wetland of India. Since these compounds exhibit estrogenic potential, we have further measured steroids and evaluated the estrogenic activity (estradiol equivalents, …

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Transmission Routes Of The Microbiome And Resistome From Manure To Soil And Lettuce, Yuepeng Sun, Daniel D. Snow, Harkamal Walia, Xu Li Jan 2021

Transmission Routes Of The Microbiome And Resistome From Manure To Soil And Lettuce, Yuepeng Sun, Daniel D. Snow, Harkamal Walia, Xu Li

Daugherty Water for Food Global Institute: Faculty Publications

The land application of animal manure can introduce manure microbiome and resistome to croplands where food crops are grown. The objective of this study was to characterize the microbiome and resistome on and in the leaves of lettuce grown in manured soil and identify the main transmission routes of microbes and antibiotic resistance genes (ARGs) from soil to the episphere and endosphere of lettuce. Shotgun metagenomic results show that manure application significantly altered the composition of the microbiome and resistome of surface soil. SourceTracker analyses indicate that manure and original soil were the main source of the microbiome and resistome …

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Opportunistic Maintenance Strategy Of A Heave Compensation System For Expected Performance Degradation, Chao Zhang, Yujie Qian, Hongyan Dui, Shaoping Wang, Rentong Chen, Mileta M. Tomovic Jan 2021

Opportunistic Maintenance Strategy Of A Heave Compensation System For Expected Performance Degradation, Chao Zhang, Yujie Qian, Hongyan Dui, Shaoping Wang, Rentong Chen, Mileta M. Tomovic

Engineering Technology Faculty Publications

In the marine industry, heave compensation systems are applied to marine equipment to compensate for the adverse effects of waves and the hydraulic system is usually used as the power system of heave compensation systems. This article introduces importance theory to the opportunistic maintenance (OM) strategy to provide guidance for the maintenance of heave compensation systems. The working principle of a semi-active heave compensation system and the specific working states of its hydraulic components are also first explained. Opportunistic maintenance is applied to the semi-active heave compensation system. Moreover, the joint integrated importance measure (JIIM) between different components at different …

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Case Study Of Gravity-Fed Mountain Spring Tap System In Ha Leronti, Lesotho, Africa, Sarah Peterson Jan 2021

Case Study Of Gravity-Fed Mountain Spring Tap System In Ha Leronti, Lesotho, Africa, Sarah Peterson

Dissertations, Master's Theses and Master's Reports

Water security has been declining rapidly in Lesotho, Africa in recent years. Lack of water has led to food insecurity, livestock deaths, and the spread of disease. Rural Basotho depend on rainfall to sustain their livelihoods; however, precipitation variability has recently increased due to climate change. For those who reside in the highlands of Lesotho, mountain springs can be a clean source of water. The tap system in the village of Ha Leronti relies on gravity to distribute water from two mountain springs to the ten village taps and nearby school campus. However, it is incapable of transporting the basic …

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Low-Flow Assessment For Ungauged Sub-Basin In Upper Ping River Basin, Thailand, Sokseyla Man Jan 2021

Low-Flow Assessment For Ungauged Sub-Basin In Upper Ping River Basin, Thailand, Sokseyla Man

Chulalongkorn University Theses and Dissertations (Chula ETD)

Water scarcity has become one of the most remarkable problems in Thailand. An assessment of low-flow may lead to better water resources management and reduce the risk of water scarcity. The assessment of low-flow in gauged basins where the flow time series are available is straightforward. The challenge exists in ungauged or poorly-gauged basins where the flow data are unavailable or of low quality. Due to the studies of low-flow assessment in ungauged basins are of limited, this study aims to address the low-flow assessment in 25 sub-basins in the Upper Ping River basin in Thailand with available data from …

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การไหลผ่านประตูระบายน้ำแบบบานเลื่อนตรงของทางน้ำที่มีขยะ, ธีรภัทร ล้อมลาย Jan 2021

การไหลผ่านประตูระบายน้ำแบบบานเลื่อนตรงของทางน้ำที่มีขยะ, ธีรภัทร ล้อมลาย

Chulalongkorn University Theses and Dissertations (Chula ETD)

การศึกษานี้เป็นการศึกษาในห้องปฏิบัติการเพื่อศึกษาถึงการไหลลอดผ่านประตูระบายน้ำแบบบานเลื่อนตรงของทางน้ำที่มีขยะในทางน้ำ ภายใต้เงื่อนไขการไหลผ่านประตูแบบไหลออกอิสระ และ ไหลออกแบบท่วมจม การศึกษานี้ดำเนินการในห้องปฏิบัติการแบบจำลองชลศาสตร์และชายฝั่งทะเล ภาควิชาวิศวกรรมแหล่งน้ำ จุฬาลงกรณ์มหาวิทยาลัย โดยดำเนินการทดลองในรางน้ำเปิดหน้าตัดสี่เหลี่ยมผืนผ้าขนาดกว้าง 0.60 เมตร ยาว 18.0 เมตร สูง 0.75 เมตร ที่มีการไหลเวียนของน้ำ การศึกษานี้ได้จำลองขยะที่ลอยอยู่บนผิวน้ำด้วยเศษวัสดุภัณฑ์ขวดน้ำพลาสติก เศษกิ่งไม้ และ อิฐมวลเบา โดยมีอัตราการไหลชองน้ำที่ใช้ในการทดลองอยู่ในช่วง 17.7 ลิตรต่อวินาที ถึง 23.5 ลิตรต่อวินาที สำหรับการทดลองภายใต้เงื่อนไขการไหลออกอิสระ และ 12.3 ลิตรต่อวินาที ถึง 18.6 ลิตรต่อวินาที สำหรับการทดลองภายใต้เงื่อนไขการไหลออกท่วมจม ตามลำดับ การทดลองทั้งสิ้นมีทั้งหมด 160 การทดลอง ที่ประกอบด้วย การทดลองภายใต้เงื่อนไขการไหลออกอิสระ 40 การทดลอง และ การทดลองภายใต้เงื่อนไขการไหลออกท่วมจม 120 การทดลอง ผลการศึกษานี้แสดงให้เห็นว่าค่าสัมประสิทธิ์อัตราการไหลของประตูระบายแบบบานเลื่อนตรง (Cd) ซึ่งเป็นดัชนีใช้ชี้วัดการไหลลอดผ่านประตูนั้น ของทางน้ำมีขยะปนจะมีค่าน้อยกว่าทางน้ำที่ไม่มีขยะปน นอกจากนี้ยังพบว่า ค่าสัมประสิทธิ์อัตราการไหล จะลดลงเมื่อปริมาณขยะเพิ่มมากขึ้น ทั้งสองเงื่อนไขของการไหลผ่านประตูระบายดังกล่าว

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การติดตามวัดผลของโครงสร้างป้องกันชายฝั่งตามแนวชายฝั่งตะวันออกของปากแม่น้ำเจ้าพระยา, วริทธิ์ เจริญฤกษ์ถวิล Jan 2021

การติดตามวัดผลของโครงสร้างป้องกันชายฝั่งตามแนวชายฝั่งตะวันออกของปากแม่น้ำเจ้าพระยา, วริทธิ์ เจริญฤกษ์ถวิล

Chulalongkorn University Theses and Dissertations (Chula ETD)

การวิจัยครั้งนี้ มุ่งศึกษา 1) การเปลี่ยนแปลงชายฝั่งตะวันออกของปากแม่น้ำเจ้าพระยา ยาว 42 กม. ในช่วง 7 ทศวรรษที่ผ่านมา 2) การตอบสนองของแนวชายฝั่งหาดเลน ต่อการมีอยู่ของโครงสร้างป้องกันชายฝั่ง และ 3) การวัดผลเขื่อนกันคลื่นในการป้องกันพื้นที่ศึกษา การเปลี่ยนแปลงชายฝั่ง ถูกประเมินจากภาพถ่ายทางอากาศและภาพดาวเทียม ที่บันทึกในช่วงปี 2549–2564 มีการสร้างข้อมูลแบบจำลองภูมิประเทศ จากการสำรวจด้วยแสงเลเซอร์แบบติดตั้งกับโดรน (UAV-LiDAR) โดยข้อมูลทั้งสองกลุ่มถูกนำมาใช้ในการประเมินประสิทธิผลป้องกันชายฝั่ง และใช้ในการสร้างเกณฑ์การออกแบบเขื่อนกันคลื่น สำหรับพื้นที่ศึกษา ผลการศึกษาพบว่าในช่วงปี 2497–2539 มากกว่า 50% ของแนวชายฝั่งที่ศึกษาเกิดการถอยร่นอย่างต่อเนื่องและรุนแรง เสียพื้นที่ไปราว 700 เฮกตาร์ ในปี 2537 กำแพงกันตลิ่งถูกสร้างตามแนวชายฝั่งเป็นระยะทาง 10 กม. ใกล้ปากแม่น้ำเจ้าพระยา ทำให้ 23% ของแนวชายฝั่ง ที่ศึกษามีเสถียรภาพจนถึงปัจจุบัน แต่อีก 70% ที่เหลือ เกิดการถดถอยอย่างรุนแรง ด้วยอัตราเฉลี่ย -15 ม./ปี ในปี 2548 เขื่อนกันคลื่นจมน้ำด้วยไส้กรอกทราย ถูกติดตั้งตามแนวชายฝั่งที่ถูกกัดเซาะ เป็นระยะทาง 25 กม ส่งผลให้ 35% ของชายฝั่งมีเสถียรภาพ อีก 56% ที่เหลือยังคงเกิดการถดถอย แต่อัตราการกัดเซาะเฉลี่ยลดลงเหลือเพียง -8 ม./ปี เนื่องจากไส้กรอกทรายมีอายุการใช้งานเพียง 4–5 ปี เขื่อนกันคลื่นด้วยหินทิ้งจึงถูกนำมาแทนที่ ในปี 2558 ทำให้แนวชายฝั่งที่เกิดการถดถอยลดลงเหลือเพียง 28% ด้วยอัตราเฉลี่ย -2 ม./ปี และมีอัตราการทับถมตะกอนด้านหลังเขื่อนเฉลี่ย 4–12 ซม./ปี ตั้งแต่ปี 2558 เขื่อนกันคลื่นใกล้ฝั่ง ถูกสร้างตามปากคลองสายหลักที่ยังคงเกิดการถอยร่นชายฝั่ง เขื่อนทุกตัวประสบความสำเร็จในการรักษาเสถียรภาพแนวชายฝั่ง และการฟื้นฟูพื้นที่ชายฝั่ง โดยมีอัตราการงอกชายฝั่งเฉลี่ย 11 ม./ปี และมีอัตราการทับถมตะกอนด้านหลังโครงสร้าง 16–32 ซม./ปี นอกจากโครงสร้างวิศวกรรมแล้ว ไม้ไผ่ชะลอคลื่น ซึ่งเป็นโครงสร้างที่ใช้วัสดุธรรมชาติ ถูกนำมาติดตั้งด้านหลังเขื่อนกันคลื่นจมน้ำ ตามแนวชายฝั่งแนวชายฝั่งพื้นที่ศึกษาตั้งแต่ปี 2545 แม้ว่าส่วนใหญ่ …

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An Accurate And Efficient Methodology To Obtain Surges For Risk Analyses For The Coast Of Bangladesh, A S M Alauddin Al Azad Jan 2021

An Accurate And Efficient Methodology To Obtain Surges For Risk Analyses For The Coast Of Bangladesh, A S M Alauddin Al Azad

UNF Graduate Theses and Dissertations

Bangladesh is one of the worst affected countries in the world in terms of tropical cyclone and storm surge effects. Until now, most of the research on annual exceedance of flood elevation for the coast of Bangladesh was based upon historical cyclone tracks along the coast. One of the major constraints of using historical tracks or tide gauge data to determine the annual exceedance of surge elevation is that the available sample size is often inadequate to capture the broad range of storm characteristics over the geographic region of interest. Over the years, several methods have been developed to increase …

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Estimating A Range Of Flow Rates Resulting From Extreme Storm Events Within The Wekiva River Watershed Through Statistical Testing And Modeling, Wesley K. Koning Jan 2021

Estimating A Range Of Flow Rates Resulting From Extreme Storm Events Within The Wekiva River Watershed Through Statistical Testing And Modeling, Wesley K. Koning

UNF Graduate Theses and Dissertations

The middle portion of the St. Johns River is located in East-Central Florida, USA. This region of the St. Johns River is increasingly subject to urbanization and conversion of forest areas to agricultural land. Overall, these changes mean that future flood events in the area could adversely impact local citizens. Therefore, the examination of extreme flood events and resiliency to such events is critical. The purpose of this preliminary study is to explore a range of practical applications to estimate extreme flood flows at watercourses within the Middle St. Johns River Basin, focusing specifically upon the Wekiva River sub-basin. The …

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Local Watershed Analysis For Hubbell And Lake Linden, Michigan, Brittany Hubbard Jan 2021

Local Watershed Analysis For Hubbell And Lake Linden, Michigan, Brittany Hubbard

Dissertations, Master's Theses and Master's Reports

This report analyzes flood frequency risk, examines drainage, and delineates local level watershed characteristics for the Site located in western HUC 12-040201 030304 Torch Lake Subwatershed. Specifically, unnamed catchments in need of HUC-14 or HUC-16 local level delineation are evaluated to determine the effects of excess runoff on the cities of Hubbell and Lake Linden, Michigan. Further, this report aims to identify the location of known or suspected historical and current drainage infrastructure, and to prioritize locations for low-impact sustainable designs that reduce excess runoff and provide flood protection for these lakeshore communities.

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Hydraulic Elevator For Purification Of Water Supply Facilities Of The Reservoir, F.Sh. Shaazizov Dec 2020

Hydraulic Elevator For Purification Of Water Supply Facilities Of The Reservoir, F.Sh. Shaazizov

Irrigation and Melioration

To clarify the granulometric composition of the deposited sediments at the inlet head of the water intake of the outlet of the Tupolangskiy reservoir, samples of bottom sediments were taken and their granulometric composition was analyzed in laboratory conditions. Near the water area of the water intake of the 1st tier of the Tupolang reservoir, the deposited sediments are represented by smaller particles, the diameter of which ranges from 5 mm to 0.1 mm and their percentage is 95%. The main results on the calculation and substantiation of the parameters of the hydraulic elevator for cleaning the water area of …

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Results Of A Numerical Study Of Currents In The Vicinity Of A Damless Water Intake, D.R. Bazarov, O.F. Vokhidov, M. Tashkhanova, F. Uljayev Dec 2020

Results Of A Numerical Study Of Currents In The Vicinity Of A Damless Water Intake, D.R. Bazarov, O.F. Vokhidov, M. Tashkhanova, F. Uljayev

Irrigation and Melioration

The problem of sustainable water intake in the conditions of significant fluctuations of flow rates and water level is significantly exacerbated by erosion of river beds. A typical example of such conditions is the damless water intake into the Karshi Main Canal (KMC) where the main flow of the Amudarya river continuously moves along a wide floodplain, changing the direction of currents. As a result, it is very difficult to withdraw the required volume of water from the river to the canal especially during dry years due to the high instability of currents at the entrance to the canal. Within …

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Prospects For Solving The Problem Of Rational Use Of Water Resources Using The Tiiame-1 Sprinkling Machine, M.Kh. Khamidov, A.R. Muratov Dec 2020

Prospects For Solving The Problem Of Rational Use Of Water Resources Using The Tiiame-1 Sprinkling Machine, M.Kh. Khamidov, A.R. Muratov

Irrigation and Melioration

The information published by the International Commission on Irrigation and Drainage, and the intermediate results of many years of research carried out by scientists from TIIAME on the development, research and implementation of water-saving technologies in agriculture are presented. The acute shortage of water resources in Central Asia, the problems of increasing the efficiency of the use of water-saving technologies around the world have led to the careful use of available water resources in the region, including the prospects and advantages of using irrigation of crops by sprinkling, as well as the design and technical parameters of the sprinkler developed …

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Inadequacy Of Current Water Use Planning At The Level Of Water Users And Wuas, A.A. Alimdjanov, A.Kh. Karimov, B.R. Nasibov Dec 2020

Inadequacy Of Current Water Use Planning At The Level Of Water Users And Wuas, A.A. Alimdjanov, A.Kh. Karimov, B.R. Nasibov

Irrigation and Melioration

This paper studies the main issues of water use planning at the level of water consumers and water user associations (WUA). The study carried out in Bulakbashi district of Andijan province of Uzbekistan, where the main source of irrigation water is the Southern Fergana Main Canal. The study followed two-stage procedure. During the first stage we compiled water use plans for the WUA and water consumers based on the applied methodology of water use planning. Then, at the second stage, we analyzed the results of the actual implementation of the farm water consumption plans and WUA water use plan, and …

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Technology And Technical Device Used In The Efficient Use Of Water Resources In Irrigated Agriculture, А.U. Аtajanov Dec 2020

Technology And Technical Device Used In The Efficient Use Of Water Resources In Irrigated Agriculture, А.U. Аtajanov

Irrigation and Melioration

The economical use of water resources, the improvement and development of new technology and technical means for its implementation, ensuring the saving of irrigation water is one of the most important issues of today. This article is devoted to the issues of improving the technology of irrigation of furrows and the creation of technical means,also recommended technology and using from created technical device in selected per experiment fields and analyzing their results.

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Empirical Assessment Of Climate Change Impacts On Agriculture In Samarkand Region, Sh.B. Babakholov Dec 2020

Empirical Assessment Of Climate Change Impacts On Agriculture In Samarkand Region, Sh.B. Babakholov

Irrigation and Melioration

Agricultural production is highly sensitive to climate factors like other endogenous factors, and the expected climate change projections may have a negative impact on the efficiency and income of agricultural producers. Therefore, this study aims to analyze the impact of changes in climatic factors (average air temperature and precipitation) on the technical efficiency of cotton growing farmers as its determinants in Samarkand region. Empirical analyzes were performed on the cases of 1141 cotton-growing farms using panel-based Time-Invariant Inefficiency model. According to the results of the analysis, cotton farms in the region have an average technical efficiency of 76%, which in …

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Car Wash Complex – Object Of Harmful Impact On Water Resources, M. Radkevich, K. Shipilova, M. Abdukodirova, O. Pochugevski Dec 2020

Car Wash Complex – Object Of Harmful Impact On Water Resources, M. Radkevich, K. Shipilova, M. Abdukodirova, O. Pochugevski

Irrigation and Melioration

Deals with the problem of the impact of car wash complexes in the city of Tashkent on water resources. The analysis of the technological process of washing and a sociological survey of car owners and employees of car washes revealed the average amount of water used per car wash per year, as well as the amount of harmful substances entering the sewer network of the city of Tashkent. Calculations have shown that the annual water consumption only for passenger cars in Tashkent is about 4.34 million m3, and the wastewater is not properly treated. From one car wash …

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