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Articles 61 - 73 of 73
Full-Text Articles in Hydraulic Engineering
Implications Of Groundwater Plume Transport And Analysis Of Karst Aquifer Characteristics In Central Florida, Daljit Sandhu
Implications Of Groundwater Plume Transport And Analysis Of Karst Aquifer Characteristics In Central Florida, Daljit Sandhu
Electronic Theses and Dissertations
Groundwater aquifers make up the primary source of drinking water in Florida. It is imperative to protect and maintain water quality to ensure optimal drinking water conditions. Florida is known for being prone to sinkholes due to karst features. One sinkhole event occurred beneath a phosphogypsum stack, and leaked a large amount of radioactive waste in the Floridan aquifer, raising water quality concerns. To study the behavior of contaminant transport, the radioactive waste plume was modeled by coupling hydraulic and chemistry concepts. Adsorption was studied to see if it can serve as a potential remediation solution to the contaminant waste, …
Field Testing And Simulation Of Vadose-Zone Recharge Wells In The Mississippi River Valley Alluvial Aquifer As An Artificial Recharge Method, Kyungwon Kwak
Electronic Theses and Dissertations
Increasing concerns regarding depletion of groundwater in the Delta region of Mississippi have led to a need to augment natural recharge. Infiltration basins are often one of the simplest means of artificially recharging aquifers. However the Delta has a layer of clay and silt at the surface so it is a better idea to use vadose-zone recharge wells that are not limited by the surficial layer of fine soils. The purpose of this study is to use full-scale field testing to assess the feasibility of using vadose-zone wells for artificial recharge of the Mississippi River Valley alluvial aquifer by using …
Groundwater Transfer And Injection Pilot Project: Construction Of A Three Dimensional Groundwater Flow Model, Wesley Bluvstein
Groundwater Transfer And Injection Pilot Project: Construction Of A Three Dimensional Groundwater Flow Model, Wesley Bluvstein
Electronic Theses and Dissertations
The Mississippi River Valley Alluvial Aquifer has experienced substantial groundwater declines in eastern Arkansas and northwest Mississippi due largely to irrigation for rice corn soybeans and other water intensive crops. To alleviate groundwater decline and ensure future sustainability of water resources the U.S. Department of Agriculture has in conjunction with the U.S. Geological Survey and the University of Mississippi initiated studies to determine potential avenues of remediation. Options include improved irrigation efficiency installation of surface weirs inter-basin transfers and groundwater transfer and injection. This study develops a three-dimensional groundwater flow model of a withdrawal well adjacent to a river for …
Evaluating The Effects Of Water Influx On The Mississippi Sound: Current Vs. Historical Relationships, Jarett Lee Bell
Evaluating The Effects Of Water Influx On The Mississippi Sound: Current Vs. Historical Relationships, Jarett Lee Bell
Electronic Theses and Dissertations
This research investigated the influence of the opening of the Bonnet Carre Spillway and other fresh water inputs on the Mississippi Sound. The Bonnet Carre Spillway was completed in 1931 and was constructed to protect New Orleans whenever the Mississippi River is at flood stage. The spillway drains into Lake Pontchartrain a brackish-water lagoon north of New Orleans which then drains into Lake Borgne and subsequently into the Mississippi Sound. The inflow of water from the spillway changes the water chemistry of all receiving water bodies and impacts the waters of the Mississippi Gulf Coast. We collected in-situ temperature specific …
Artificial Intelligence In Wet Weather Infrastructure, Matt Hammerstein
Artificial Intelligence In Wet Weather Infrastructure, Matt Hammerstein
Williams Honors College, Honors Research Projects
Effective management of runoff from rain and snowmelt is critical as increased water flows can negatively affect efficiency and reliability at treatment facilities, as well as potentially damage property or the natural environment. Implementation of artificial intelligence for real-time decision making and support in wet weather infrastructure is a recent technological development; as such, a problem has emerged: experience and knowledge of best practices for successful implementation is limited. Artificial intelligence is being employed to inform operational decisions that are intended to improve the efficiency and reliability of physical wet weather infrastructure. The goal of municipalities and utilities in utilizing …
Developing A Calibrated Seepage Meter To Measure Stream-Aquifer Interaction In The Mississippi Delta, Wesley J. Bolton
Developing A Calibrated Seepage Meter To Measure Stream-Aquifer Interaction In The Mississippi Delta, Wesley J. Bolton
Electronic Theses and Dissertations
The Mississippi Alluvial Plain (MAP) is a premier region for irrigated agriculture in the United States producing approximately 9 billion dollars in annual revenues. The region receives around 138 cm of precipitation annually; however irrigation is necessary to maximize crop yields as most of the precipitation does not occur during the growing season. There are 8 million irrigated acres within the Mississippi Alluvial Plain. The source of most of the irrigated water is the surficial aquifer in the Mississippi Embayment the Mississippi River Valley Alluvial Aquifer (MRVAA) and due to the reliance on irrigation for maximum crop yields recent potentiometric …
Flood Inundation Mapping For Huron Creek, Houghton County, Michigan, Sarah Washko
Flood Inundation Mapping For Huron Creek, Houghton County, Michigan, Sarah Washko
Dissertations, Master's Theses and Master's Reports
The 2018 Father’s Day Flood rattled the Houghton County, MI community. Thousands of dollars in damage to public and private property were incurred due to slope failure, scour and stagnant water. Though the flood was billed as a once-in-a-lifetime event, hazard mitigation planning has become essential, as extreme weather events are expected to become more frequent with a changing climate. While Federal Emergency Management Agency funding will provide detailed flood hazard maps in the future, mapping is expected to be several years out. To aid the City of Houghton community with immediate flood hazard mitigation planning, a hydraulic-based flood depth …
Hydroclimate Drivers And Atmospheric Dynamics Of Floods, Nasser Najibi
Hydroclimate Drivers And Atmospheric Dynamics Of Floods, Nasser Najibi
Dissertations and Theses
Our preliminary survey showed that most of the recent flood-related studies did not formally explain the physical mechanisms of long-duration and large-peak flood events that can evoke substantial damages to properties and infrastructure systems. These studies also fell short of fully assessing the interactions of coupled ocean-atmosphere and land dynamics which are capable of forcing substantial changes to the flood attributes by governing the exceeding surface flow regimes and moisture source-sink relationships at the spatiotemporal scales important for risk management. This dissertation advances the understanding of the variability in flood duration, peak, volume, and timing at the regional to the …
Technology For Integrated Groyne-Vetiver Erosion Reduction (Tiger): Case Study In A West African River, Chase M. West
Technology For Integrated Groyne-Vetiver Erosion Reduction (Tiger): Case Study In A West African River, Chase M. West
Dissertations, Master's Theses and Master's Reports
River erosion is a problem all over the world. The effects of river erosion are especially hard for farmers in developing countries, where the river is an important part of their farming practices and daily lives. A case study was done in the small village of Fode Binea in Senegal, West Africa to reduce this stream erosion. A new hybrid approach, Technology for Integrated Groyne-Vetiver Erosion Reduction (TIGER) method, was developed. The method includes combining groynes at the toe of the riverbank to reduce toe erosion in the channel and planting a buffer strip with vetiver grass to reduce erosion …
Impacts And Adaptive Measures For Groundwater Use In The Mekong Delta. Case Study : Tra Vinh Province, Tuan Pham Van
Impacts And Adaptive Measures For Groundwater Use In The Mekong Delta. Case Study : Tra Vinh Province, Tuan Pham Van
Chulalongkorn University Theses and Dissertations (Chula ETD)
Because of the rapid growth of population and fast economic development in the Vietnamese Mekong Delta (VMD), the surface water resources are unable to meet these demands and groundwater is also over-abstracted. Groundwater depletion and saline water intrusion become the main problems that threaten drinking water supplies, farming systems, and livelihoods in the delta, especially coastal areas. It is necessary to provide a fully comprehensive picture of groundwater use (GWU) and its impact issues In Tra Vinh Province, a coastal province of VMD, dependency on GW increases from north to south which has a strong relation with availability of freshwater …
การสะท้อนและการส่งผ่านคลื่นของเขื่อนกันคลื่นแบบไม่เต็มส่วน, นันทวุฒิ อินทรียงค์
การสะท้อนและการส่งผ่านคลื่นของเขื่อนกันคลื่นแบบไม่เต็มส่วน, นันทวุฒิ อินทรียงค์
Chulalongkorn University Theses and Dissertations (Chula ETD)
ปัญหากัดเซาะชายฝั่งในประเทศไทยมีความรุนแรงอย่างมากในปัจจุบัน โดยเฉพาะอย่างยิ่งในบริเวณอ่าวไทยตอนบน ที่ซึ่งมีลักษณะเป็นหาดโคลน มีเพียงโครงสร้างที่สามารถส่งถ่ายน้ำหนักและแรงลงสู่ชั้นดินที่ลึกลงไปเท่านั้นที่สามารถสร้างในพื้นที่โคลนนี้ได้ การใช้โครงสร้างเสาเข็มปักลงในดินและมีชิ้นส่วนลักษณะคล้ายกำแพงในบริเวณผิวน้ำ โดยขอนิยามว่า “เขื่อนกันคลื่นแบบไม่เต็มส่วน” อาจเป็นตัวเลือกที่เหมาะสมในการป้องกันพื้นที่ที่มีลักษณะเป็นฐานรากอ่อน อย่างไรก็ตามประสิทธิภาพการทำงานของเขื่อนกันคลื่นแบบไม่เต็มส่วนยังไม่ได้รับการพิสูจน์ จึงเป็นเหตุให้การศึกษานี้มีวัตถุประสงค์เพื่อศึกษาความสัมพันธ์ระหว่างคุณสมบัติคลื่นและลักษณะทางกายภาพของโครงสร้าง กับความสามารถในการสะท้อนและการส่งผ่านคลื่น แบบจำลองทางกายภาพ 2 มิติถูกพัฒนาในอ่างจำลองคลื่น ภายใต้เงื่อนไขคลื่นสม่ำเสมอที่ถูกสร้างจากเครื่องกำเนิดคลื่นด้วยความชันคลื่น (Hi/L) ในช่วง 0.010 – 0.025 แบบจำลองเขื่อนกันคลื่นถูกสร้างจากเหล็กกล่องด้วยการเปลี่ยนแปลงความลึกการจมจาก 0.075 – 0.300 เมตร และช่องว่างระหว่างเสาเปลี่ยนแปลงจาก 0.5 – 1.5 เมตร ระดับน้ำนิ่งและความหนาของเขื่อนกันคลื่นทีค่าคงที่เท่ากับ 0.45 และ 0.0375 เมตร ตามลำดับ การทดลอง 120 กรณีถูกดำเนินการโดยมีวัดขนาดของความสูงคลื่นด้านหน้าและหลังโครงสร้าง แล้วคำนวณค่าสัมประสิทธิ์การสะท้อนและการส่งผ่านคลื่น จากผลการศึกษาแสดงให้เห็นว่า ค่าสัมประสิทธิ์การสะท้อนและการส่งผ่านคลื่นมีความสัมพันธ์กับความหนาโครงสร้างสัมพัทธ์ (b/L), ความลึกโครงสร้างสัมพัทธ์(D/d), ปัจจัยความไม่เต็มส่วนของเขื่อนกันคลื่น, ความลึกสัมพัทธ์ (d/L), ความสูงคลื่นสัมพัทธ์ (Hi/d) และความชันคลื่น (Hi/L) ค่าสัมประสิทธิ์การสะท้อนของคลื่นมีค่าลดลงอย่างเอกซ์โพเนนเชียลเมื่อ b/L, d/L, Hi/d หรือ Hi/L เพิ่มขึ้น แต่มีค่าเพิ่มขึ้นเมื่อ D/d เพิ่มขึ้น ทั้งในกรณีที่คลื่นล้นและไม่ล้นข้ามโครงสร้าง อีกทั้งเมื่อคลื่นล้นข้ามโครงสร้างจะทำให้ค่าสัมประสิทธิ์การสะท้อนของคลื่นลดลง สำหรับผลลัพธ์ของการส่งผ่านคลื่นพบว่าการส่งผ่านคลื่นมีแนวโน้มที่ลดลงอย่างเอกซ์โพเนนเชียลเมื่อ b/L, d/L, Hi/d หรือ Hi/L เพิ่มขึ้น แต่มีค่าเพิ่มขึ้นเมื่อปัจจัยความไม่เต็มส่วนของเขื่อนกันคลื่นเพิ่มขึ้น ทั้งในกรณีที่คลื่นล้นและไม่ล้นข้ามโครงสร้าง อีกทั้งค่าสัมประสิทธิ์การส่งผ่านยังเพิ่มขึ้นเมื่อคลื่นสามารถล้นข้ามโครงสร้างได้ นอกจากนี้ยังพบว่าการเปลี่ยนแปลงช่องว่างระหว่างเสาไม่มีความแตกต่างอย่างมีนัยสำคัญต่อค่าสัมประสิทธิ์การสะท้อนและการส่งผ่านคลื่น ในการศึกษานี้ได้พัฒนาสมการของสัมประสิทธิ์การสะท้อนและการส่งผ่านคลื่นด้วยวิธีการวิเคราะห์ความถดถอยเชิงซ้อน เพื่อสนับสนุนการออกแบบโครงสร้างในการบรรเทาปัญหากัดเซาะชายฝั่งสำหรับพื้นที่แบบหาดโคลนในอนาคต
Shear Stress Estimates In The Approach And Bridge Section By Using Various Formula, Jun Seon Lee
Shear Stress Estimates In The Approach And Bridge Section By Using Various Formula, Jun Seon Lee
Graduate Theses, Dissertations, and Problem Reports (ETD)
Shear stress is the resistance force on top of the contact surface caused by moving flow and is one of the important variable in fluid mechanics. Thus, a lot of researches have been conducted to predict accurate value of shear stress. However, calculating shear stress with existing equations has several limitations because only gradually varied flow and/or uniform flow was considered in their studies. Therefore, direct applying those methods into complex flow type, such as around a bridge, to predict shear stress is questionable.
Thus, laboratory experiments were carried out in a laboratory flume to attack the objective of this …
Review Of Water Allocation Models For West Virginia, Madison Lee Alexis Thompson
Review Of Water Allocation Models For West Virginia, Madison Lee Alexis Thompson
Graduate Theses, Dissertations, and Problem Reports (ETD)
Modeling river basins started gaining in popularity and usage in the western part of the United States in large part due to its extreme droughts. Planning is necessary to sustain the population, industries, and recreational water use year-round. Water allocation modeling is a tool used to aid in the issues that come from managing water resources. This work considers the continuous models that synthesized the hydrologic processes that occur and provides a simulation of past, current, or future conditions.
West Virginia, located on the eastern side of the United States, does not have an extreme drought problem as seen in …