石期河流域岩溶水系统及其水资源构成分析

Analysis on karst groundwater system and its water resources composition in Shiqihe basin

在深入研究石期河流域岩溶水系统含水介质结构特征、水资源形成的基础上,通过对流域岩溶水总排泄口流量动态长观资料系列的分析,选择2005年丰水期内最后一次洪峰(年内最大洪峰)后的流量衰减过程,根据该过程的数据资料建立本流域岩溶水总排泄口的流量衰减方程,并利用该流量衰减方程对流域岩溶水资源的构成进行定量分析研究。结果表明,石期河流域岩溶水系统在2005年最大洪峰状态下,可自然排泄的岩溶水资源总量为69469.95×104m3,其中:流域坡面产流占3.64%,赋存于大型溶洞或管道中的溶洞-管道水占4.53%,赋存于小型管道或强岩溶化裂隙中的管道-裂隙水占74.10%,赋存于细小溶蚀裂隙中的溶隙水占17.73%。从衰减期的初始时刻起,它们各自可供消耗(可作为有效利用岩溶水资源)的时效分别为2日、8日、35日和126日以上。

Based on the further study to the aquifer structure characteristics and water resources formation of the karst groundwater system in Shiqihe basin, the flow attenuation process after the last flood peak in 2005 （the biggest flood in the year） was taken as the data source to establish a total discharge-flow attenuation equation through the series analysis on the long-term abservation data of the dynamic flow at the total discharge site. And then, the water resources composition was studied and analyzed by means of the attenuation equation in the paper. The results show that total natural karst water discharge of the Shiqi river karst groundwater system is 69 469.95 ×10^4 m^3 during the largest flood peak in 2005, which is composed of 4 parts： Slope runoff accounts for 3.64%, large scale karst conduit flow accounts for 4.53%, small karst conduit flow or strong developed karst fissure flow accounts for 74.10%, and small karst fissure flow accounts for 17.73 %. From the initial attenuation （can be regarded as the effective karst water resources） ,those flow can last for 2, 8 and 35 as well as more than 126 days respectively.