摘要
目的分析渭河河床沉积物的垂向渗透系数随深度的变换规律及原因。方法采用水头下降竖管渗透试验法对渭河(陕西段)眉县、咸阳、西安草滩、西安临潼4个不同地点,共8个试验点位上的河床上、下两层沉积物垂向渗透系数(Kv)作了试验研究。结果眉县4测试点上、下两层沉积物渗透系数相等,眉县5测试点下层沉积物渗透系数值比上层大,其余6个测试点上层沉积物Kv值均大于下层,上、下层沉积物Kv之比在1.11～7.87之间。结论河床沉积物Kv值随深度增加而减小,其变化并不完全是由沉积物粒度分布上的不同引起的,还受到地表水与地下水在潜流带的水文过程以及生物扰动等共同作用的影响。
Aim To analyze the rules and reasons of the vertical hydraulic conductivity of sediments changes with depth in Weihe River. Methods In this study, the bilevel valves of vertical hydraulic conductivity （ Kv） for a stre- ambed were derived by using falling-head standpipe permeameter tests conducted at four test locations in eight test points including Meixian, Xianyang, Caotan and Lintong. Results The superstratum Kv test value is the same as the substratum at test point 4 of Meixian. At test point 5 of Meixian the superstratum Kv test value is lower than the substratum. Besides, for the other six test points, the superstratum Kv test value is higher than the substratum and the ratio of superstratum to substratum is 0. 42 - 7. 87. Conclusion The Kv values of riverbed sediment decreases with increasing depth, which is not entirely caused by the different sediment particle size distribution, but the com- bined action of sediment particle size distribution, surface porosity of sediment, the hydrological processes between surface water and ~roundwater. and bioturbation as well.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第1期109-114,共6页
Journal of Northwest University（Natural Science Edition）
基金
国家自然科学基金资助项目(51079123)
教育部留学科研基金资助项目(教外司留[2010]1174)
教育部新世纪优秀人才支持计划基金资助项目(NCET-11-1045)
关键词
渭河
垂向渗透系数
沉积物深度
the Weihe river
vertical hydraulic conductivity
sediment depth
