滇东断陷盆地南洞岩溶地下水系统地下河水文动态特征与资源量评价

Underground River Hydrological Dynamic Characteristics and Resource Evaluation of the Nandong Karst Water System in East Yunnan Faulted Basin

本文对滇东断陷盆地南洞岩溶地下水系统各地下河的水文动态特征进行了分析,推断了南洞岩溶地下水系统的结构特征。根据岩性构造、地下河发育以及补径排关系,将其划分为四个子系统。分别采用降雨入渗系数法和径流模数法对南洞岩溶地下水系统的天然资源量进行计算,计算结果分别为35610.7万m^(3)/a和33460.2万m^(3)/a。用枯季径流模数法对南洞岩溶地下水系统的可采资源量进行了计算,计算结果为23407.3万m^(3)/a,其可开采资源量巨大。南洞地下河在没有天然补给量的情况下,120天消耗的调蓄量为4503.3万m^(3),南洞地下河日允许开采资源量为49.4万m^(3)/d。二号暗河建库蓄水条件下库区上游的日允许开采量为75.9万m^(3)/d,蓄水库容来源于工程设计,资源保证程度高。本次研究可为南洞岩溶地下水资源的开发利用和调配提供科学依据。

In this paper,the authors analyzed underground river hydrological dynamic characteristics of the Nandong karst water system in east Yunnan faulted basin and inferred the structure features of the Nandong karst water system.This system can be divided into four subsystems according to the lithological structure,the development of underground rivers,and the relationship between fill paths and rows.The rainfall infiltration coefficient method and the runoff modulus method were used to calculate the natural water resources of the Nandong karst groundwater system.The calculation results were 356107000 million m^(3)/a and 33602200 m^(3)/a,respectively.The dry season runoff modulus method was used to calculate the recoverable resources of the Nandong karst groundwater system.The calculation result was 234073000 m^(3)/a,and the recoverable resources were huge.Under the condition that the natural supply of the Nandong Underground River was cut off,the adjusted storage capacity consumed in 120 days was 45033000 m^(3),and the daily allowable mining resources of the Nandong Underground River were 494000 m^(3)/d.Under the condition of impoundment of No.2 underground river,the daily allowable mining volume in the upper reaches of the reservoir area was 759000 m^(3)/d.The storage capacity comes from engineering design,and the degree of resource assurance was high.This study can provide a scientific basis for the development,utilization and deployment of Nandong karst groundwater resources.