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季节性河道渗漏野外试验研究

, PP. 74-78

Keywords: 季节性河道,入渗,包气带,水分运动,大沽河

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Abstract:

为研究季节性河流大沽河河道的渗漏规律,以包气带水分运动理论为基础,在大沽河上、中游建立有代表性的试验场,进行野外现场入渗试验,研究不同包气带岩性下河道的入渗能力。结果表明干涸河道入渗过程可分为非稳定入渗和稳定入渗两个阶段;包气带的水理性质影响着河床的入渗规律,大沽河河道上游的入渗率比中游的入渗率大,上游和中游南沙梁村试验场的稳定入渗率分别为0.028cm/s和0.023cm/s;非稳定入渗过程为1.5~2.0h,其入渗量占总渗漏量的比例较小,并随时间逐渐减少,用稳定入渗率计算大沽河行洪期河道的渗漏量是可行的。

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