Unconfined aquifer water has a greater exposure to contamination from external sources, such as rain, streams and rivers. Water that seeps into unconfined aquifers may also originate from urban sources, such as canal and drain runoff. As a result, these aquifers may be exposed to a higher risk...
2.1.2 Flow equations-confined and unconfined aquifer (2D) The governing equation describing the flow in a 2D nonhomogeneous confined aquifer is given as (Bear, 1979): (4)∂∂xTx∂h∂x+∂∂yTy∂h∂y=S∂h∂t+Qwδx−xiy−yi−qs The governing equation describing the fl...
Mixed confined and unconfined groundwater flow occurs in a bounded initially dry aquifer when the hydraulic head at the side boundary suddenly rises above the elevation of the aquifer's top boundary. The flow problem as modelled by the Boussinesq equation is non-trivial because of the involvement...
1.infiltrate v.渗透 2.aquifer n.含水土层, 蓄水层 3.unconfined aquifer 非承压含水层 无压含水层 4.confined aquifer 自流含水层 承压含水层 5.recharge area 补给区 6.water table n. 地下水面(门窗泻水台)7.vadose zone 渗流区 8.aquitard 半透水层 弱含水层 9.aquiclude n.含水土...
Describes a simple and inexpensive laboratory model for demonstrating the hydraulic responses of confined and unconfined aquifers to pumping. A worked example is included to demonstrate the operation of the model.-from Authorsdoi:10.1016/0305-4403(84)90037-2Robert W. Gillham...
Transient confined-unconfined flow conversion caused by pumping in a confined aquifer (i.e., piezometric head drops below the top confined layer) is complicated, partly due to different hydraulic properties between confined and unconfined regions. For understanding mechanism of the transient confined-...
The paper presents a data base of hydrochemical and hydraulic groundwater measurements of a younger Pleistocene multilayered, unconfined/confined aquifer system in NE Germany. The Institute of Landscape Hydrology of the Leibniz Centre for Agricultural Landscape Research (ZALF) e. V...
Tunnelling and Underground Space Technology, 2024, 153: 106023. DOI:10.1016/j.tust.2024.106023 4. Guo, Y., Zhang, Z., Du, C. et al. An analytical solution for groundwater inflow of circle foundation pit with suspended waterproof curtains in the unconfined aquifer. Environmental Earth ...
A three dimensional finite element model for fluid flow and transport in confined or unconfined aquifer : F. Jacob, J. M. Crolet, P. Lesaint & J. Mania, in: Water pollution III: modeling, measuring and prediction, ed L.C. Wrobel & P. Latinopoulos, (Computational Mechanics Publications)...
The initial concept proposed byJacob[1940] was that a change in groundwater head measured in a piezometer was directly proportional to the change in atmospheric pressure. The constant of proportionality was referred to as the BE. BE=0 for an unconfined aquifer in which, by definition, the wate...