黄河三角洲沉积物及其渗透系数空间分布特征.

The sedimentprocess of modern Yellow River delta is active and complex, and the attribute of sediment particle as well as the spatial distribution of hydraulic conductivity dominate the surface water and groundwater interaction, water and salt transport of regional groundwater and the evolution of wetland ecological environment. Based on the 70 shallow sediment samples with 10 cm, 30 cm and 90 cm depth across the delta, the particle size parameters and hydraulic conductivity and their spatial distribution were analyzed. The results show that the shallow sediment is mainly composed of fine sand and silt, with an average effective particle diameter of 5.2 μm and a belt pattern from the vertex of delta to seashore; particle size of shallow sediment is large in the highland near Diaokouhe and Shenxiangou channels. The average hydraulic conductivity (K) is 0.65 m/d, with a limited spatial variation and gradually decreasing trend with depth. The average K near Shenxiangou channel is 0.98 m/d, which is notably higher than that of the other region and is the largest in average and variance for 30 cm depth. K along the Qingshuigou channel is smaller than that along the Diaokouhe channel, and the average and variance of K are both the smallest in the two reserves. The sediment particle size and distribution under different sedimentary environment are the main causes of differences in K. [ABSTRACT FROM AUTHOR]