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河床沉积物的渗透性是影响河水与地下水水量交换大小的一个重要因素。以沙颍河为例,采用原位竖管法测定了沙颍河界首-阜阳段河床沉积物垂向渗透系数Kv和任意方向渗透系数Ks,并采用变水头渗透仪法测得界首、太和实验点河床沉积物渗透系数。通过对比分析两种实验结果,得到沙颍河河床沉积物渗透性很小,但呈现从上游到下游逐渐变小的趋势,且呈明显各向异性,局部受采砂等人类活动的影响。
The permeability of riverbed sediments is an important factor affecting the exchange of water volume with groundwater. Taking the Shaying River as an example, the vertical permeability coefficient Kv and the arbitrary permeability coefficient Ks of the sediments in the Jieshou-Fuyang section of the Shaying River were measured by the in-situ standing pipe method. The water head permeability, Taihe Experimental Point River bed sediment permeability coefficient. Through comparative analysis of the two experimental results, it is found that sediments in the Shaying River sediment have a small permeability, but show a trend of becoming smaller from the upper reaches to the lower reaches, with obvious anisotropy and local effects of human activities such as sand mining.