摘要
广西来宾峰林平原系统经过长期演化，内部结构有序度已接近最佳状态，具有以下岩溶水文地质特征：①具有成熟的三元垂直分带；②浅层岩溶带厚约３０ｍ，有效孔隙率２．５％，调蓄能力强；③中层岩溶带厚约７０ｍ，未充填洞穴发育，有效孔隙率１．５％，侧向水流通畅；④水位动态平缓，过程曲线主要反映降雨的季节变化；⑤含水层的疏干和回灌易于实现。基于上述特点提出利用地下空间调蓄径流的构想，其基本思路是在枯水季节抽取超过天然径流量的地下水，形成人工降落漏斗，以获得需要的水资源量；雨季通过天然回灌，把调节库容重新充满。此法可作为峰林平原区治旱调蓄的新手段。
The internal structure and karst feature sequences in the peak forest plain system have been in good order as a result of long period development in Laibin karst area. The aquifers possess typical hydrogeologic & karstic characteristics as follows: ①There are mature vertical zones of karst development, that is, epikarst zone, middle and deep cave zone,and the latter two are the main objects of groundwater exploration in the area.② The epikarst is about 30m in thickness with an average effective porosity of 0.025. It possesses a great potential of regulated capability and considerable permeability.③The thickness of middle cave zone is about 70m, which is characterized by an effective porosity of 0.015, and development of unfilled caves and karst conduits.④The ascending part of the water level with time is very steep,but the attenuation part appears fairly gentle, and the changes of groundwater level mainly react to the seasonal changes of precipitation.⑤Drainage and recharge of the drawdown cone in epikarst aquifer is rather fast.Accordingly, a proposal is to take underground reservoir as runoff regulation. The principle is that an artificial drawdown cone (underground reservoir storage)is formed by overpumpping groundwater in the dry season in order to obtain necessary water for irrigation, and the underground reservoir is filled again by natural recharge in the next wet season.This type of reservoir fits the natural conditions in karst plain areas where groundwater table is less than 30m. This method may be an effective tool for runoff regulation.
出处
《中国岩溶》
CAS
CSCD
1999年第1期19-27,共9页
Carsologica Sinica
基金
广西留学回国人员科学基金
关键词
峰林平原
岩溶水
地下水库调蓄
含水层
广西
Peak forest plain area Karst water Runoff regulation by underground reservoir Laibin County of Guangxi
