降水的随机模拟及其在灌溉中的应用

The Stochastic Simulation of Daily Rrainfall and Its Application in Irrigation Scheduling

本文研究了一个由简单的产生逐日降水的方法用在水量平衡方程中确定作物的灌溉量和灌溉时间的模拟模型。该降水模型用月平均的气象资料产生逐日降水,并且在水量平衡模型中将蒸发蒸腾量值进行了随机化处理。对陕西省的扶风县和大荔县分别进行了23年和29年的冬小麦和夏玉米的灌溉模拟。利用模拟结果分析了灌水量和最可能产生缺水的时间。此方法可用于半干旱地区在各种降水情况下的灌溉模拟。

A simulation model has been studied by coupling a simple daily rainfall generator with water balance model to determine irrigation dates and amounts. Average monthly climatic date have been used to generate daily precipitation in rainfall model. Stochastic treatment of crop evapotranspiration data have been introduced. Irrigation simulation studies for winter wheat and summer corn at Fufeng (twenty-three years) and Dali (twenty-nine years) in Shaanxi province have been carried out.The modeling results were analysfei to evaluate the irrigation amounts and most possible date whill soil water shortage occured. This method could be used to simulate the irrigation schedule under variable rainfall Conditions in semi-arid areas.