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天津市北部碳酸盐岩浅埋区构造属下仓—林南仓复向斜,向斜的周边及底部有良好的隔水边界,是一个十分理想的蓄水构造。奥陶系石灰岩分布面积340平方公里,厚约800米,岩溶及裂隙十分发育,具有相当大的储水空间。从地质条件分析,修建地下水库是完全可行的。 北系河流除上游水库拦蓄外,每年尚有15亿吨弃水,保证率可达百分之五十,回灌水源是有保证的。 兴建地下水库具有不占地、不移民、工期短、施工易和投资少等优点,在技术上是可行的,在经济上是合算的。竣工后的地下水库每天可向使用部门提供相当于天津市自来水公司每天供水的水量。
The carbonate rock shallow zone in the northern part of Tianjin City is a silo - Linnan Cang-syncline, with good water-tight boundary at the periphery and bottom of the syncline. It is a very ideal water storage structure. Ordovician limestone area of 340 square kilometers, about 800 meters thick, karst and fractures are developed, with considerable storage space. From the analysis of geological conditions, the construction of underground reservoirs is entirely feasible. In addition to the interception of rivers in the upper reaches of reservoirs, there are still 1.5 billion tons of abandoned water each year, with a guaranteed rate of 50%. The water supply for recharging is guaranteed. The construction of underground reservoirs has the advantages of no occupation, no resettlement, short construction period, easy construction and less investment, which is technically feasible and economically cost-effective. Upon completion, underground reservoirs may provide daily usable water to Tianjin Waterworks Company to the user departments.