流澜河间地块岩溶发育特征及形成机制

Karst Development Features and Formation Mechanism of Interfluve in Liulan River

在对流澜河间地块水文地质条件和岩溶发育分析基础上,采用聚类分析方法将钻孔揭露的岩溶现象进行了统计分析,据此将研究区划分为3个发育程度不同的岩溶区:补给岩溶区、补给径流岩溶区和汇流排泄岩溶区。不同区岩溶发育特征不同:补给岩溶区岩溶发育弱,主要形成岩溶裂隙,发育深度较小,一般<40 m;补给径流岩溶区岩溶发育深度较大,一般<100 m,以岩溶裂隙为主,偶见溶洞;汇流排泄岩溶区岩溶最为发育,溶洞规模大,岩溶发育深度一般<50 m。从补给岩溶区到补给径流岩溶区和汇流排泄岩溶区,岩溶发育特征受区域地下水流动系统控制。

By analysing the hydrogeology condition and the karst development characteristics of interfluve in Liulan rivers and the karst holes,the study area is divided in different development levels：recharge karst region,recharge-runoff karst region,runoff-discharge karst region.The karst development features are different in the three regions.In recharge karst region,karst develops not so well that karst features are mainly vertical solution crack,with the side of 40 meter deep.Karst develops deeper in recharge-runoff karst region with the depth of about 100 meter,consisting of solution cracks and karst caves.In runoff-discharge region,karst features are rich,with large cave in shallow depth of about 50 meter as the main feature.From recharge karst region to recharge-runoff karst region and runoff-discharge karst region,karst characteristics are controlled by regional groundwater flow system.The theory of groundwater flow system is used to discuss the mechanism of karst formation.