单 位：
河套灌区义长灌域管理局;黄河水利科学研究院
关键词：
浑水灌溉;泥沙级配;土壤水分;累积入渗量;沉积层
摘 要：
通过在测坑中开展灌溉条件下2种含沙量4种泥沙级配组合下的浑水灌溉入渗试验,发现泥沙级配对土壤水分增长过程的影响显著:泥沙级配越细,相同灌溉入渗历时的累积入渗量和土壤含水量增加量越小,与清水灌溉试验结果的差异性越大。土壤含水量的增长过程与累积入渗量变化过程均符合指数为正的幂函数关系,说明土壤含水量的增长过程是灌水量在土壤中的分配过程;累积入渗量的变化过程反映了作为整体——测坑土壤含水量的增加过程,某一时刻的累积入渗量是灌溉过程中同时刻不同深度土壤含水量的变化量的叠加。针对泥沙级配作用下土壤水分的增长特性,其成因在于浑水灌溉时土壤表面形成的沉积层,含沙量越大,泥沙级配越细,沉积层越密实,水分通过空隙所受的阻力越大,导致土壤水分增长越缓慢。
译 名：
Analysis of the Characteristics and Causes of the Increase of Soil Moisture Content Under Muddy Water Irrigation with Different Sediment Gradations
作 者：
BIAN Yan-li;CAO Hui-ti;CHANG Zhi-fu;Yellow River Institute of Hydraulic Research of YRCC;Yichang Irrigation Area Administration Bureau of Hetao Irrigation District;
关键词：
muddy water irrigation;;sediment gradation;;soil moisture content;;accumulative infiltration capacity;;sediment deposition
摘 要：
Through the experiment on the infiltration of muddy water irrigation under combinations of two sediment concentrations and four different sediment gradations,it has been found that sediment particle sizes affect the growth process of soil moisture significantly.The smaller the sizes of sediment particles in muddy water are,the less their accumulative infiltration capacity and content of soil moisture increase,while the more the differences with the results of clean water irrigation test are.The growth process of soil moisture and changing process of accumulative infiltration capacity are in line with the positive power function relationship,indicating that the growth process of soil moisture is the irrigation quantity distributing process in soil.The changing process of accumulative infiltration capacity reflects the increasing process of test pit soil moisture content;accumulative infiltration capacity of a certain time of infiltration are superimposed with the changing content of different depths of soil moisture in the process of irrigation at the same time.According to the growing characteristics of soil moisture with muddy water irrigation of different sediment gradations,the causes of that lies in the sediment deposition formed on the soil surface under muddy water irrigation,the greater the sediment concentration and the finer the sediment gradation are,the more denser the sediment deposition is,then the greater the resistance of water through the soil void is,which leads to the slower growth of soil moisture content.
