作物生长条件下潜水蒸发的数值模拟研究

Digital Simulation Study of Phreatic Water Evaporation Under Crops Growing

作物生长条件下的潜水蒸发不仅与地下水埋深和土质有关 ,作物的种类、根系发育程度对潜水蒸发的影响也不容忽视 ,特别是在作物生长旺盛期 ,根系吸水占潜水蒸发很大比例。为此 ,以由能量平衡原理及边界层水气扩散理论导出的Penman_Monteith公式为基础 ,在考虑根系吸水的情况下 ,建立潜水蒸发模型 ,并采用全隐式有限差分格式进行求解。采用北京市水科所永乐店试验站的资料对模型进行检验 。

The phreatic water exaporation under crops growing is not only related to depth of groundwater table and soil texture but also to crop type and roots development especially in the period of crop growing luxuriantly. For this reason, a phreatic water exaporation model based on the Penman_Monteith formula is developed and can be solved by a totally hidden finite difference form. The model is tested by the data of Yongledian Experiment Station of Beijing Institute of Water Resources and the effect factors of phreatic water evaporation under crops growing are also analysed.