地下水基本概念ppt課件(編輯修改稿)
2025-05-29 12:53 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 ial to allow fluids to pass through an interconnected work of pores is a characteristic known as permeability. A permeable material（ 透水物質(zhì) ） is one through which water flows easily,whereas an impermeable material is one through which water flows slowly or not at all. The permeability of a material depends on several factors: Number of available conduits Size of the conduits Straightness of the conduits (2)aquifers and aquitards Aquifers（ 含水層 ） :sediment or rocks that transmit water easily. Aquitards（ 弱透水層 ） :sediment or rocks that do not transmit water easily and therefore retard the motion of water. Aquicludes（ 隔水層 ） :sediment or rocks that do not transmit water at all. unconfined aquifers（ 無壓含水層 ） :aquifers that intersect the surface of the Earth . confined aquifers（ 承壓含水層 ） :aquifers that are separated from the surface by an aquitard or aquiclude ,as the water they contain is isolated from the surface. An aquifer is a highporosity, highpermeability it has access to the ground surface,it’s an unconfined it’s trapped below an aquitard,a rock with low permeability,it’s a confined aquifer. (3)Water table（潛水面或地下水面） : geologists define a boundary ,above which pore spaces and cracks contain mostly air and below which they contain only water. The region of the subsurface above the water table is called the unsaturated zone, and the region below the water table is the saturated zone, Water table (a) The geometry of the water table, illustrating the saturated zone, the unsaturated zone, and the capilary fringe. Water table (b) The surface of a permanent pond is the water ta
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