ABSTRACT: Recent theoretical work on stream depletion and water level responses to pumping a well near a stream include the (semi-) analytical solutions by Hunt (1999), Zlotnik and Huang (1999), and Butler et al. (2001). Yet, few field studies assessed the limiting assumptions and physical concepts inherent in the theoretical models. A long-term study of stream depletion under typical condition...

Northern peatlands store globally significant amounts of soil carbon that could be released to the atmosphere under drier conditions induced by climate change. We measured forest floor respiration (RFF) at hummocks and hollows in a treed boreal bog in Alberta, Canada and partitioned the flux into aboveground forest floor autotrophic, belowground forest floor autotrophic, belowground tree respir...

Groundwater models provide an efficient means to evaluate the sustainability of new groundwater production wells. An important component of any groundwater modeling analysis is the quantification of the prediction uncertainty. This analysis incorporates uncertainty analysis techniques within the groundwater modeling environment to predict regions within a groundwater basin that have a low proba...

A detailed record of benthic foraminifera carbon isotopes from the intermediate-depth South East Atlantic margin shows little glacial-interglacial variability between MIS-12 to MIS-10, suggesting that Northern Atlantic deepwaters consistently penetrated to at least 30 S. Millennialscale increases in either the mass or flux of northern-sourced deepwaters over the core site occurred alongside red...

Estimates of thermal drawdown in Bot Dry Rock geothermal systems have been made with two different models of heat transfer from hydraulically fractured reservoir rock blocks to water circulated through the fracture permeability. One model is based on deconvolution of experimental tracer response curves into a network of flowpaths connected in parallel with heat transfer calculated individually ...

[1] A semianalytical solution is presented for a mathematical model describing the flow of groundwater in response to a slug or pumping test in a highly permeable, confined aquifer. This solution, which is appropriate for wells of any degree of penetration and incorporates inertial mechanisms at both the test and observation wells, can be used to gain new insights into hydraulic tests in highly...

Problem Statement: In general, the drinking water systems sourced from ground water (GW) contains chemicals at double the current maximum contaminant levels (MCL) of colloids. However, due to increasing demand of water, groundwater may be subjected to over-exploitation and the natural equilibrium is thus disturbed. A steady-state condition is established between seawater and freshwater in a coa...

MODFLOW is a groundwater modeling program. It can be compiled and remedied according to the practical applications. Because of its structure and fixed data format, MODFLOW can be integrated with Geographic Information Systems (GIS) technology for water resource management. The North China Plain (NCP), which is the politic, economic and cultural center of China, is facing with water resources sh...

Introduction According to the National Research Council (2010), a significant challenge in the GISciences is the creation and development of tools that enable the results of scientific modeling to be easily understood. For science-informed decision making as well as for the purposes of informing and engaging ordinary citizens in discussions regarding geographical technologies, the National Rese...

Dam decommissioning (DD) is a viable management option for thousands of ageing dams. Reservoirs are large carbon sinks, and reservoir drawdown results in important dioxide (CO2) methane (CH4) emissions. We studied the effects DD on CO2 CH4 fluxes from impounded water, exposed sediment, lotic water before, during, 3–10 months after Enobieta Reservoir, north Iberian Peninsula. During study period...