根据水流运动过程推求土壤入渗参数和田面糙率的研究

Determination of infiltration parameters and manning roughness according to process of water flow in border irrigation

以水量平衡原理为基础,提出了畦田尾部闭合条件下利用两组畦灌水流运动数据推求土壤平均入渗参数和田面糙率的方法,该方法在确定入渗参数和田面糙率过程中避免了采用难以准确确定的田面水深数据。利用大田畦灌试验对所提方法进行了检验,并将该方法所求土壤入渗参数和田面糙率值代入WinSRFR模型中模拟水流运动过程,其与田间实测过程相比,两者具有好的一致性,由此表明该方法能够简单有效地求得畦灌土壤平均入渗参数和田面糙率值。

Based on the principle of water volume balance,a method was proposed to determine infiltration parameters and Manning roughness according to two groups of field irrigation data under blocked-end border irrigation.The validity of the proposed method is verified by experimental data,then the values of infiltration parameters and Manning roughness were introduced into the WinSRFR model.The process of water flow was simulated by WinSRFR model,and the simulated value had a good fit to the measured.The results show that infiltration parameters and Manning roughness can be effectively determined with the new method,which may lay a foundation for technical element design and operation evaluation of a border irrigation project.