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Showing 1 to 20 of 32 for “"hydraulic gradients"”.
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Investigating Subsurface Flow Delivery to a Small High Arctic River
Preferential flow pathways and hydraulic gradients along the hillslope-floodplain-channel continuum are dominant controls on the delivery of baseflow, stormflow and solutes to channels in temperate systems. Arctic systems are increasingly being shown to possess similar delivery mechanisms, however …
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A Study on the Long-Term Performance of Seepage Barriers in Dams
… that seepage barriers often drastically increase hydraulic gradients around the boundaries of the barrier, and through any windows or defects in the barrier. The result is increased water pressures and hydraulic gradients behind and around the barrier. These increased pressures and gradients have …
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A vacuum permeability test for compacted clay
A vacuum permeability test utilizing high hydraulic gradients has been devised for compacted clay of low permeability. The test induces easily measurable flow rates in virtually impervious soils by placing a vacuum at the drainage end of the sample and an elevation head at the inflow end. The …
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Assessment of Ground Water Exchange in Two Stream Channels and Associated Riparian Zones, Jocko Valley, Western Montana
… balance for the Sque-que study site. Vertical hydraulic gradients, temperature monitoring and ground water chemistry were key components used to identify areas of surface water/ground water exchange.I concluded that surface water/ground water interactions are occurring on sub-reach scales …
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Assessment of Ground Water Exchange in Two Stream Channels and Associated Riparian Zones, Jocko Valley, Western Montana
… balance for the Sque-que study site. Vertical hydraulic gradients, temperature monitoring and ground water chemistry were key components used to identify areas of surface water/ground water exchange.I concluded that surface water/ground water interactions are occurring on sub-reach scales …
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HYDRAULIC COMPATIBILITY OF GEOTEXTILES FILTERING RECYCLED MATERIALS
… are used in such construction schemes, hydraulic compatibility of recycled materials with geotextile filters and long-term performance of these geotextiles are essential. A series of long-term filtration (LTF) tests were performed to evaluate the hydraulic compatibility of several woven …
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Long-Term Hydrologic Sustainability of Calcareous Fens Along Glacial Lake Agassiz Beach Ridges, Northwestern Mn
… responses to rainfall events and associated hydraulic gradients suggest the calcareous fens are well-connected to the beach-ridge aquifer. Wells in the beach-ridge aquifers and wells in and below the fens respond synchronously to rainfall events. Water chemistry and stable isotopes are …
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Field Observations and Numerical Simulations of Groundwater Dynamics Within Cabretta Island, A Georgia Barrier Island
… data showed that the storm significantly altered hydraulic gradients and increased hydraulic head by 50 centimeters in the marsh and 1 meter in the dunes. Both field and numerical results suggest high energy storms have the potential to drastically change flow directions and salinities from …
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Geology and ground-water resources of the Tannersville-Tumbling Creek area, Washington, Smyth, and Tazewell counties, Virginia
… of subsurface waters. The locally reversed hydraulic gradients of groundwater infiltrating the Tonoloway in various portions of the area along Poor Valley between Tumbling Creek and Tannersville are largely determined by streams, tributary to the North Fork of the Holston River, which have …
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Sealing performance assessments of bentonite and bentonite/crushed rock plugs.
… by weight mixed with well-graded crushed rock. Hydraulic properties of the mixture plugs may be highly anisotropic if significant particle segregation occurs during sample installation and compaction. Temperature has no negative effects on the sealing performance within the test range from room …
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Seepage of Groundwater into the St. Clair River Near Sarnia, Ontario, Canada
… u x 10-8 m 3/s/m2 suggests higher chan expected hydraulic conductivity or hydraulic gradients in the streambed, 2 to 4 orders of magnitude greater than those determined in previous studies. Detectable levels of some organic contaminants were found in the strearnbed groundwater samples, i.e., …
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The Effects Of Waste Leachates On The Hydraulic Conductivity Of Natural Clays (volumes I And Ii)
… or compacted clay borrow. The liner acts as a hydraulic barrier to control the flux of contaminants from the waste into the adjacent groundwater. In order to do this clay liners are required to have low hydraulic conductivity, k (typically 10{dollar}sp{lcub}-8{rcub}{dollar} cm/s) that shall not …
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Forward modelling and inversion of streaming potential for the interpretation of hydraulic conditions from self-potential data
… to aid in the evaluation of subsurface hydraulic conditions. Of specific interest is the application of the method to embankment dam seepage monitoring and detection. This demands a quantitative interpretation of seepage conditions from the geophysical data. To enable the study of …
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Constructed Floodplain Wetland Effectiveness for Stormwater Management
… wetland (CW) water budget, 2) estimate wetland hydraulic characteristics during overbank flows, and 3) quantify the event-scale nutrient assimilative capacity of the constructed wetland. CW water table elevations and hydraulic gradients were measured through an array of nested piezometers. …
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Characterization of Pre and Post Re-Naturalized Surface Water/Groundwater Exchange, Jocko River, Flathead Indian Reservation, Montana
… objective of this research was to establish the hydraulic link between the stream and floodplain under pre-restored/re-naturalize conditions; assist the Confederated Salish and Kootenai Tribes in design and implementation efforts to re-naturalize the Jocko River. The Jocko River was instrumented …
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Characterization of Pre and Post Re-Naturalized Surface Water/Groundwater Exchange, Jocko River, Flathead Indian Reservation, Montana
… objective of this research was to establish the hydraulic link between the stream and floodplain under pre-restored/re-naturalize conditions; assist the Confederated Salish and Kootenai Tribes in design and implementation efforts to re-naturalize the Jocko River. The Jocko River was instrumented …
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Effects of basecourse saturation on flexible pavement performance.
… tests also showed that fines were transported at hydraulic gradients in excess of l resulting in clogging of pore channels and large reductions in permeability. Comparative analyses were carried out to assess the response of saturated and unsaturated pavement sections using the deformation …
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Improvements of MPM and Its Applications in Modelling Rapid Soil/Water Movements
… interaction is a central challenge for studying hydraulic problems such as seepage flows through embankments, overtopping induced dam failures and the erosion of riverbanks and coastal areas. Since numerical simulations are significantly less costly tools than physical experiments even on a small …
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Investigation of salinity and nutrient characteristics of two groundwater based flow systems on Virginia's Eastern Shore
… meters/meter) and horizontal (0.001-0.005 m/m) hydraulic gradients of wells located across the marsh suggested movement of freshwater offshore which was confirmed by the direct measurement of submarine groundwater discharge (SGWD) using seepage meters. Upland wells contained high nitrate …
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Water flow and heat transport modelling at the interface between river and aquifer
… complex and multidimensional, driven by surface hydraulic gradients and groundwater discharge. This thesis presents the results of an integrated approach of studies, ranging from the acquisition of field data, the development of analytical and numerical approaches to analyse vertical temperature …
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