双河洞国家地质公园洞穴冲积物粒度特征分析

Analysis on Grain Size Characteristics of Cave Sediments in Shuanghe Cave National Geopark

通过分层采集双河洞国家地质公园中山王洞洞穴冲积物,利用Mastersizer2000激光粒度分析仪进行测试分析。研究结果表明:(1)山王洞地下古河道沉积物优势粒级以粉砂、黏土为主,其含量占总体水平的70%以上;(2)沉积物颗粒较细且分布集中,与地表河沉积粒度相比,洞穴冲击形成的沉积物颗粒更细,反映洞穴古河道河流水位稳定或水动力较弱,洞穴流域范围内地表植被好,地表侵蚀不严重。

Through stratification samplings, the sediments of Shanwang cave in Shanghe were collected and grain size analysis was made by Mastersizer 2000. Results showed that Cave （1） the dominate grain fraction of sediments in Shanwang Cave ancient underground channel, with a National Geopark silt and clay were general level of over 70 % ; （2） the grain size of sediment was smaller and distributed concentratedly, compared with that of river deposition, which meant that the water level of Shanwang Cave ancient underground channel was stable or water power was weak. The ground vegetation was lush and the soil erosion was not serious in watershed range.