An approximation is obtained for the recession of a sloping aquifer. The analytical approximation can provide a useful tool to analyze data and obtain physical properties of the aquifer. In contrast to the case of a horizontal aquifer, when plotting the time derivative of the flux versus the flux on a log scale, the result shows that the flux derivative reaches a minimum value and that the curv...

Protection of ground water for present and future use requires monitoring and understanding of the mechanisms controlling long-term quality of ground water. In this study, spatial and temporal trends in concentrations of nitrate and pesticides in ground water in the eastern San Joaquin Valley, California, were evaluated to determine the long-term effects of agricultural and urban development on...

Transmissivity is an important hydraulic parameter to determine the amount of water passed horizontally across a given saturated thickness of an aquifer. The techniques to quantify this parameter, such as grain size analyses or pumping tests, can have limitations of time/spatial scale, viability, or economically. One technique that can be used, but little adopted, is the capture zone analysis. ...

[1] The Martian outflow channels were carved by the eruption of catastrophic floods from groundwater aquifers. This study models the time evolution of a typical outflow channel flood originating within a chaos region. The flood initiates when superlithostatic pore pressures within a confined aquifer lead to the propagation of hydrofractures through the confining cryosphere to the surface. The p...

A shallow aquifer with different redox zones overlain by intensive agricultural activity was monitored for the occurrence of 1,2-dichloropropane (DCP) to assess the fate and origin of this pollutant. DCP was detected more frequently in groundwater samples collected in aerobic and nitrate-reducing zones than those collected from iron-reducing zones. Simulated DCP concentrations for groundwater e...

STRUCTURE, DEVON ISLAND, CANADA. P. Lindgren, C. Broman, N. G. Holm, J. Parnell, S.A. Bowden, G.R. Osinski, P. Lee, Department of Geology and Geochemistry, Stockholm University, S-106 91 Stockholm, Sweden, Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen AB24 3UE, U.K., Departments of Earth Sciences and Physics and Astronomy, University of Western Ontario, 1151 Rich...

IMPACT STRUCTURE, DEVON ISLAND: IMPLICATIONS FOR THE SEARCH FOR BIOMARKERS ON MARS. J. Parnell, G.R. Osinski, P. Lee, C. S. Cockell, C.W. Taylor, Dept. of Geology & Petroleum Geology, University of Aberdeen, Aberdeen AB24 3UE, U.K., [email protected], Dept. of Geology, University of Arizona, U.S.A., Mars Institute and SETI Institute, NASA Ames Research Center, Moffett Field, CA 94035-1000, U...

Department of Science and Technology, College of Arts and Sciences, Bryant University, Smithfield, RI 02917, USA b State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi’an 710075, PR China c School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China d LPS, Nanjing Institute of Geology and Palaeontology, CAS, Nanjing 210008, PR China Departme...

1 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, 100029 Beijing, China 2 Shandong Institute and Laboratory of Geological Sciences, 250013 Jinan, China 3 Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029 Beijing, China 4 State Key Laboratory of Loess...