| Seasonal rivers in arid or semi-arid regions are often in a state of water or less water.The flood occurs in the rainy season. The infiltration of seasonal river directly influences the evolution of flood and the process of groundwater recharge. Therefore, it is of great practical significance to study the regularity of the seasonal flood and the accurate prediction of the seasonal flood and the calculation of groundwater recharge.On the basis of relevant research results at home and abroad river infiltration law, the paper investigated the Dagu River’s different sections of hydrology, meteorology, geology. Through the indoor test of vertical infiltration, test and numerical simulation of lateral infiltration, we analyzed the infiltration law rivers under different conditions and factors. In this paper, we chose three sand collection points as the research object along the Dagu River bed, respectively, upstream of the city of Laxi sun Shou Zhen, middle reaches of Jimo City, Li Jia Zhuang village, downstream of Jiaozhou City Li Ge Zhuang village. In the process of experiment, we measured the sample of dry density, grain size distribution and moisture characteristic curve. Through indoor vertical soil column infiltration test and lateral soil bin infiltration test,the unsaturated infiltration process of the river course was studied. Through the indoor experimental research, some conclusions are drawn, and the main results were as follows:(1) Through investigation of the site,we selected sun Shou Zhen and Li Jia Zhuang village and Li Ge Zhuang village sand sample as studying objects along the Dagu River. Through the test we won the actual measurement of different sand soil water characteristic curves of, fitting the moisture characteristic curve obtained by van Genuchten model, and analyzes the curve of different sand;(2) In the vertical to the soil column experiment, we studied three different sand under the constant head into the infiltration conditions and different initial water rate under the condition of vertical to the infiltration process, and got the soil column at different positions in different time of water rate and infiltration rate, and comparative analysised of three kinds of sand like infiltration on law. According to test result, when the sample was in vertical infiltration, the infiltration rate changes mainly divided into two processes: at the start of the test, sample moisture content was small, the infiltration rate was large. Along with the infiltration, the infiltration rate decreases gradually to a stable value. The infiltration flux of fine sand were 0.025 m L/(s·cm2) and 0.021 m L/(s·cm2) when the intial moisture contain was 1.02%and 5.11%, and the infiltration flux of medium sand were 0.028 m L/(s·cm2) and 0.026 m L/(s·cm2) when the intial moisture contain was1.38% and 3.51%,and the infiltration flux of coarse sand were 0.029 m L/(s·cm2) and 0.028 m L/(s·cm2) when the intial moisture contain was1.38% and 3.51%.(3) In the process of lateral soil bin testing and the condition of constant head infiltration, we studied three different sample in lateral infiltration process under the condition of different initial moisture content, and obtained the moisture content of the soil bin different positions in different time and infiltration rate, and comparative analysised of three kinds of sample infiltration law. According to test result, when the sample was in lateral infiltration, the infiltration rate changes mainly divided into two processes: at the start of the test, sample moisture content was small, the infiltration rate was large. Along with the infiltration, the infiltration rate decreases gradually to a stable value. The infiltration flux of fine sand were 0.025 m L/(s·cm2) and 0.023 m L/(s·cm2) when the intial moisture contain was 1.85%and 5.79%, and the infiltration flux of medium sand were 0.027 m L/(s·cm2) and 0.026 m L/(s·cm2)when the intial moisture contain was1.39% and 4.32%,and the infiltration flux of coarse sand were 0.028 m L/(s·cm2) and 0.027 m L/(s·cm2)when the intial moisture contain was1.98% and 2.44%. |
