摘要
[目的]研究季节性河流大沽河河道包气带入渗过程及入渗参数,建立适宜描述季节性河道入渗模型。[方法]以大沽河上、中、下游3处代表性河床野外垂向入渗试验数据为基础,利用Matlab软件对Horton模型、Kostiakov模型、Philip模型进行拟合,求得模型入渗参数,并评价模型的适宜性。[结果](1)随上、中、下游沙样孔隙度、粒径、渗透系数依次减小,干容重依次增大,其稳定入渗速率依次减小,约为0.006 6,0.004 1,0.002 5cm/s;(2)Matlab软件中Isqcurvefit函数适用于求模型入渗参数;(3)Horton模型对上、中、下游河床入渗过程拟合系数最高。[结论]Horton模型对入渗过程拟合效果最好,且模型参数具有物理意义,适宜描述季节性河床入渗过程。
[Objective]This paper studied the infiltration process and infiltration parameters of the Dagu River aeration zones in the seasonal river,and established a suitable model for describing the seasonal river infiltration.[Methods]Based on the experimental data of vertical infiltration of 3 representative rivers on the upper,middle and lower reaches of Dagu River,Horton model,Kostiakov model and Philip model were fitted by Matlab software,the infiltration parameters were obtained,and the suitability of the infiltration model was evaluated.[Results]（1）In the upper,middle and lower reaches,with the successive decreases of sand porosity,particle size,permeability coefficient,dry bulk density increased correspondingly,and the steady infiltration rate decreased,with rates of 0.006 6,0.004 1,0.002 5 cm/s.（2） The Isqcurvefit function in Matlab software was applied to obtain infiltration parameters of infiltration model.（3） The Horton model had the highest fitting coefficients for the infiltration process of the upper,middle and lower reaches of the river bed.[Conclusion]The Horton model performed the best in the simulation of infiltration process,and the model parameters have virtual physical meaning,and can be used to describe the infiltration process of seasonal river bed.
出处
《水土保持通报》
CSCD
2017年第6期152-156,共5页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目"季节性河道渗漏影响洪水演进机理及效应研究"(51309137)
关键词
季节性河流
大沽河
野外试验
入渗速率
入渗模型
seasonal channel
Dagu River
field experiment
infiltration rate
infiltration model
