【摘要】 基于非饱和土质渠床有压单点入渗试验,对自由渗漏情况下土壤有压入渗入渗率随时间的变化过程进行了系统性的分析,建立了渠床土壤有压点入渗经验模型,研究了土壤入渗模型参数与水深之间的函数关系。基于点入渗参数与水深之间的函数关系,提出了沿断面积分计算渠道输水渗漏量的模型。该计算模型通过入渗模型参数全面反映了渠道土质、干容重、含水量和水深对渗漏量的影响。计算实例表明:与考斯加科夫公式计算结果相比较,该计算结果可更真实地反映渠道渗漏量随时间的变化过程,并具有更高的精度,证明利用点入渗参数计算渠道输水渗漏量是可行的。更多还原

【Abstract】 Based upon the point experiments on pressure infiltration processes in an unsaturated earth-lined channel,an empirical model for calculating seepage losses from earth-lined irrigation channels is developed.The parameters of model are empirically correlated with the water depth in the channel.The seepage loss is estimated through integrating the cumulative infiltration along the channel wetted perimeter.The model is validated with the experimental data.The result shows that the model can has a better performance on seepage loss estimation than that of using the Kostiakov infiltration model that is also empirically based.The simulated seepage loss process using the model agrees well with the observation,which demonstrates the feasibility of using the point cumulative infiltration approach to calculate seepage losses from earth-lined irrigation channels.更多还原