学术
森林覆盖的喀斯特地区表层岩溶带的产流阈值
姜光辉[1,2] 吴吉春[1] 郭芳[2] 李华举[2] 孙海龙[2]
[1]南京大学水科学系,江苏南京210093 [2]中国地质科学院岩溶地质研究所岩溶动力学重点实验室,广西桂林541004
摘 要:
选择中国南方喀斯特森林石山地区的表层岩溶带中出露的泉水为研究对象，通过对泉水水位、pH、电导率、水温和降水的连续监测，发现表层岩溶带的降水补给的产流阈值为12mm。同时分析了不同降水补给引起的表层岩溶泉pH、温度、电导率的变化规律。雨季pH在降水后出现暂时的降低，电导率和水温出现暂时的升高。旱季pH、电导率等表现出比雨季更复杂的变化。按照水位、pH、电导率、水温对降水补给的反应的强弱不同，将表层岩溶带对降水的反应分成三个等级。第一等级为表层岩溶泉的流量等都不发生变化；第二等级是表层岩溶泉的4个指标有部分发生微小缓慢的变化；第三等级是表层岩溶泉的4个指标发生显著的变化。表层岩溶带的产流阈值是区别有效降雨和无效降水的标准，并对理解岩溶地下水的形成有帮助。[著者文摘]
文章出处:
《水科学进展》-2008年19卷1期 -72-77页
文献标识码:
A
文章编号:
1001-6791（2008）01-0072-06
Threshold value of epikarst runoff in forest karst mountain area
JIANG Guang-hui, WU li-chun, GUO Fang, LI Hua-ju, SUN Hai-long（ 1. Department of Water Sciences, Nanjing Unitmrsity, Nanjing 210093, China ; 2. Karst Dynamics Laboratory, Institute of Karst Geology, Guilin 541004, China ）
Abstract:
An epikarst spring in the forest karst mountain area in the southwestern China is selected for this study. The con- tinuous auto-monitoring of the spring＇s discharge, pH, electrical conductivity（EC）, water temperature （T） and rainfall has been done for more than one year. The results indicate that, generally, in rainy season, the spring＇s pH shows a temporary decrease after rainfall, and the spring＇s EC increases temporally, while the spring＇s T displays a transitory increase. However in dry season the behaviors of these parameters are different. According to the spring＇ s different reflection to rainfall ranging from faintness to intensity, the response can be classified into three grades. The first grade is characterized by unchange after rain in discharge, pH, EC and T. The second grade shows slow and little change in a part of these parameters. The third grade indicates a distinct change in all of the four parameters. Basing on the spring＇s response, it is determined that the threshold value of runoff in the epikarst is 12 mm of rainfall. For epikarst, the threshold value is the mark to distinguish between the effective and invalid rainfall. It is also an important parameter for the study on the formation of groundwater resources.[著者文摘]
Key words:
epikarst area; rainfall; threshold value of runoff ; forest; karst area
基金资助:
中国地质调查局地质调查项目（1212010340104;1212010634806）;中国地质科学院岩溶地质研究所所长基金资助项目（200602）
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