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土壤中水流分为水平流和垂直流两种。对一个固定地块来讲,局部水平流又分为扩散期水平流和补给期水平流。垂直流又分为上升水流和下降水流。只有搞清壤中流之规律,才能实施正确的灌溉、排水计划。一、局部水平流 1961年在山东德州灌溉试验站,测定过局部水平流强度。雨(灌)后,地下水位升高,向周围地边沟或非耕地排泄,称扩散期水平流;因农田蒸发,地下水位下降很快,当低于周
Soil water is divided into two kinds of horizontal flow and vertical flow. For a fixed land, the local horizontal flow is divided into diffusional horizontal flow and recharge horizontal flow. Vertical flow is divided into rising water and falling water. Only by studying the law of mid-stream flow can we implement the proper irrigation and drainage plan. First, the local level flow 1961 Shandong Texas irrigation pilot station, measured the level of partial horizontal flow intensity. After rain (irrigation), the groundwater level rises and is drained to the ditches around the ground or to the non-cultivated land, which is called the horizontal flow during the spreading period. Due to the evaporation of the farmland, the water table drops rapidly,