Liujiang basin is an important water source area of Qinhuangdao city. The surface collapse will happen at hidden karst areas, due to much exploiting of ground-water.

柳江盆地是秦皇岛市的重要水源地，由于大量开采地下水，在隐伏岩溶发育区将引起地表塌陷。

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It is necessary to ascertain developing regulation and scattering feature of the shallow karst cave in order to effectively appraise unstable factors brought by hidden karst terrain.

为有效评价隐伏型岩溶地段带来的不稳定性因素，有必要查明区内浅层溶洞的发育规律及分布特征。

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The main geological environmental problems include slope disasters, siltation of river courses and mouths, contamination of water and soils, tectonic instability and hidden karst collapses.

主要地质环境问题有斜坡灾害、河道、口门淤积，水土污染，构造稳定性和隐伏岩溶塌陷等。

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