管井出水量减少是常见的问题，特别是第四系松散层中的管井更为普遍。
The reducing in water production of tube well is a familiar problem, especially in the loose bed of the quaternary system.
从大连红黏土被第四系松散层所覆盖的现象出发，分析了大连地区沿海岸附近冰碛残丘的特征与形成过程。
The characteristic and the formation process of moraine hill in the Dalian area along the coast are analyzed from the phenomenon of the Quaternary incompact layer covering the Dalian red clay.
塌陷主要分布在松散层较薄的第四系覆盖区，发生时间主要集中于枯水年份或年内枯水期和丰水期初。
The collapse mainly occurs in the low - water years or during the beginning of the dry season and rain season in a year.
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