建筑論文—地下水中英文對(duì)照(參考版)
2025-06-10 00:14本頁(yè)面
【正文】 the lateral type,in which water is diverted into a number of small furrows from the main canal or channel。and gravitational waters, which is excess soil water draining through the soiled. The intermediate zone extends from the bottom of the soilwater zone to the top of the capillary fringe and may vary from nonexistence to several huntween the nearground suiface region and the nearwaterwater table region through which infiltrating waters must passed. The capillary zone extends from the water table to a height determined by zone thickness ia a function of soil texture and may vary not ongly from region to region but also within a local area network. The water that can be drained from a soil by gravity is known as the specific yielding. It is expressed as the ratio of the volume of water that can be drained by gravity to the gross volume of the of specific yield are dependent on soil particle size average, shape and distribution of pore, and degree of pletion of the soiled. Average values of specific yield for alluvial aquifers range frome 10% to 20%.An aquifer is a waterbearing stratum or formation capble of transmitting water in quantities sufficient to permit may be considered as falling into two categorise,confined and unconfined,depending on whether or not a water table or free within an aquifer is change whenever water is recharged to or discharged from an saturated,confined aquifer,pressure changes produce only slight changs in storage this cases, the weight of the overburden is supposed partly by hydrostatic pressure and pattly by the soild material in the the hydrostatic pressure in a confined aquifer is reduced by pumping or other means,the load on the aquifer increase, causing its pressional, with the result that some water is forced from its. Decreasing the hydrostatic pressure also causes a small expansione, which in turn produces an additional release of confined aquifer, the water yield is expressed in terms of a storage coefficient Scarcely. This strong coefficient may be defined as the volume of water that an aquifer takes in or relleases per unit surface area of aquifer per unit change in head normal to the addition to waterbearing strata exhibiting satisfactory rates of yield,there are also nonwaterbearing and imperm
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