Measurement method of recession discharge of karst depression—A case study on Ganjiacao karst depression in Qingmuguan underground river, Chongqing
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摘要: 岩溶洼地在淹没条件下的消水是一种特殊的有压管道流，如何测定这种管道流的流量是岩溶水文研究中的一大难题。本文分析了岩溶有压管道流的特殊性，提出了用洼地库容变化推求H～Q关系的基本理论和方法。利用重庆市青木关地下河甘家槽洼地的消水资料详细阐述了在淹没条件下入库流量、库容退水流量和在某一水位条件下的消水总量的推求方法。文中还介绍了在岩溶洼地水位观测站的设置方法。Abstract: Recession discharge in submerged karst depression is a special type of pressurized pipe-flow. So, the measurement of the discharge of this pipeline flow is one of major problem in karst hydrology study. The particularity of the pressurized pipe-flow is analyzed and a basic theory and method for inferring the relationship between H and Q is made by means of change in storage capacity of the depression in this paper. And then, method of reservoir inflow under submerged conditions, recession discharge of storage capacity, and total recession discharge under a certain water level is described in detail based on the data from Qingmuguan karst underground river system. In addition, the installation method of field water level monitoring station is introduced briefly in the paper.
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