ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

In the traditional water movement model of the furrow irrigation based on water balance method, it is necessary to determine the value of the figure coefficient of infiltration water (σz) before simulating water flow of the furrow irrigation, which affected the precision of the model. The relationship between the figure coefficient of infiltration water and water flow under furrow irrigation was analyzed, an analytic model of furrow irrigation on the basis of water balance method was set up, and the iterative algorithm to the analytic model was determined. The influence of different σs values in 0.70～0.80 on the model compute results was studied, the model results were verified with some research results and field experimental values. The results showed that the problem of getting σz directly with difficulty was solved and the accuracy of the model was improved. It is also found that different σs values in 0.70～0.80has little influence on the model compute results and when the σs value is 0.75, it has better accuracy for the model than that when the σs value is 0.70 or 0.80. The study indicated that the analytic model has some advantages, such as simple calculation method and solution, high accuracy. 