Mark D. Ankeny, Mushtaque Ahmed, T. C. Kaspar, Robert Horton
Abstract A new method is proposed for determining in situ unsaturated hydraulic conductivities from unsaturated infiltration measurements made at several tensions on the same infiltration surface. Wooding's equation for steady‐state unconfined infiltration rates is used in calculating hydraulic cond...
Abhijit Mukherjee, Dipankar Saha, Charles F. Harvey, Richard G. Taylor et al.
The Indian Sub-Continent is one of the most densely populated regions of the world, hosting ∼23% of the global population within only ∼3% of the world's land area. It encompasses some of the world's largest fluvial systems in the world (River Brahmaputra, Ganges and Indus Basins), which hosts some o...
Mashfiqus Salehin, Aaron I. Packman, Matthew Paradis
Hyporheic exchange is generally analyzed with the assumption of a homogeneous hyporheic zone. In reality, streambed sediments have a heterogeneous structure, and this natural heterogeneity produces spatially variable interfacial fluxes and complex hyporheic exchange patterns. To assess the basic eff...
Mohammad Shamsudduha, Richard G. Taylor, Kazi Matin Ahmed, Anwar Zahid
J.M. McArthur, Pradip K. Sikdar, M. A. Hoque, Utsab Ghosal
Across West Bengal and Bangladesh, concentrations of Cl in much groundwater exceed the natural, upper limit of 10 mg/L. The Cl/Br mass ratios in groundwaters range up to 2500 and scatter along mixing lines between waste-water and dilute groundwater, with many falling near the mean end-member value f...
Holly A. Michael, Clifford I. Voss
K. A. Radloff, Yan Zheng, Holly A. Michael, M. Stute et al.
Drinking shallow groundwater with naturally elevated concentrations of arsenic is causing widespread disease in many parts of South and Southeast Asia. In the Bengal Basin, growing reliance on deep (>150 m) groundwater has lowered exposure. In the most affected districts of Bangladesh, shallow groun...
Lingwei Kong, Hossain Md. Sayem, Huihui Tian
Due to the formational environment and climatic variability, granite residual soils with grain-size distribution ranging from gravel to clay undergo multiple drying–wetting cycles. The influences of multiple drying–wetting cycles on the soil-water characteristic curve (SWCC) and pore-size distributi...
Mahfuzur R. Khan, Mohammad Koneshloo, Peter S.K. Knappett, Kazi Matin Ahmed et al.
Many of the world's megacities depend on groundwater from geologically complex aquifers that are over-exploited and threatened by contamination. Here, using the example of Dhaka, Bangladesh, we illustrate how interactions between aquifer heterogeneity and groundwater exploitation jeopardize groundwa...
Holly A. Michael, Clifford I. Voss
Irina Gaus, D.G. Kinniburgh, John Talbot, R. Webster
Melanie Kandelaars Polygravia, Mark Smith, Mary Paden, Peter Laban et al.
The importance of groundwater in social and economic development is easily overlooked. Its value in the economy and in economic development is frequently underestimated when policy makers in governments, business investors or local farmers and communities assume that the springs, wells and boreholes...
P.B. Leeds‐Harrison, E.G. Youngs, Burhan Uddin
Summary A device that infiltrated water over a small circular surface area having a radius ranging between 1.45 mm and 2.5 mm was used to measure the sorptivity of initially air‐dry aggregates of size greater than 20 mm. The small infiltration area caused the water uptake to be dominated by capillar...
M. M. R. Jahangir, Patrick Johnston, M. Barrett, M. I. Khalil et al.
Identification of specific landscape areas with high and low groundwater denitrification potential is critical for improved management of agricultural nitrogen (N) export to ground and surface waters and indirect nitrous oxide (N₂O) emissions. Denitrification products together with concurrent hydrog...
Ariel Nunez Garcia, Hardiljeet K. Boparai, Ahmed Ishtiaque Amin Chowdhury, Cjestmir V. de Boer et al.
Sulfidated nano zerovalent iron (S-nZVI), stabilized with carboxymethyl cellulose (CMC), was successfully synthesized on site and injected into the subsurface at a site contaminated with a broad range of chlorinated volatile organic compounds (cVOCs). Transport of CMC-S-nZVI to the monitoring wells,...