Publication Date
4-1-2018
Abstract
A fault-controlled karst basin is a special type of karst landform. It is defined as a basin-like topography surrounded by mountains, which is fully or partly karstified. Fault-controlled karst basins play a great role on urbanization and economic development of Yunnan Province which is located in a mountainous region. Baiyi Basin is a sub-basin of the Kunming faulted Basin with typical hydrogeological characteristics for a fault-controlled karst basin. It is also one of the most important drinking water source protection zones of Kunming City. In order to better understand the hydrogeological nature of this fault-controlled karst basin and to better protect the valuable groundwater resources, a pilot study focusing on the hydrochemical characteristics of fault-controlled karst basin springs was carried out in Baiyi Basin. A total of 10 springs in the basin are selected in this study. Water Temperature, Electric Conductivity (EC), and pH value were measured in situ. Water samples from these 10 springs were analyzed for Ca2+, HCO3-, F-, Cl-, NO3-, Br-, DOC, DIC contents and stable isotopic ratios (δ18O and δ2H). Results show that (1) the hydrochemical characteristics of fault-controlled karst basin are more complex than for a normal basin owing to the intense tectonic activities. Within the Baiyi fault-controlled karst basin, there are not only epikarst springs, shallow karst springs, and confined karst springs, but also non-karst springs. Even deep groundwater may be involved in the water cycle. (2) Water isotopic data reveal that Qinglongtan (QLT) Springs (QLT1 to QLT4) and a Heilongtan Spring (HeiLT1) share a common recharge water source. (3) Among 9 of 10 studied springs, nitrate concentrations slightly exceed of the drinking water standard (10mg/l).
Rights Information
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.
DOI
https://doi.org/10.5038/9780991000982.1066
The Hydro-Chemical Characteristics of a Karst Faulted Basin: Case Study of the Baiyi Basin, Kunming, China
A fault-controlled karst basin is a special type of karst landform. It is defined as a basin-like topography surrounded by mountains, which is fully or partly karstified. Fault-controlled karst basins play a great role on urbanization and economic development of Yunnan Province which is located in a mountainous region. Baiyi Basin is a sub-basin of the Kunming faulted Basin with typical hydrogeological characteristics for a fault-controlled karst basin. It is also one of the most important drinking water source protection zones of Kunming City. In order to better understand the hydrogeological nature of this fault-controlled karst basin and to better protect the valuable groundwater resources, a pilot study focusing on the hydrochemical characteristics of fault-controlled karst basin springs was carried out in Baiyi Basin. A total of 10 springs in the basin are selected in this study. Water Temperature, Electric Conductivity (EC), and pH value were measured in situ. Water samples from these 10 springs were analyzed for Ca2+, HCO3-, F-, Cl-, NO3-, Br-, DOC, DIC contents and stable isotopic ratios (δ18O and δ2H). Results show that (1) the hydrochemical characteristics of fault-controlled karst basin are more complex than for a normal basin owing to the intense tectonic activities. Within the Baiyi fault-controlled karst basin, there are not only epikarst springs, shallow karst springs, and confined karst springs, but also non-karst springs. Even deep groundwater may be involved in the water cycle. (2) Water isotopic data reveal that Qinglongtan (QLT) Springs (QLT1 to QLT4) and a Heilongtan Spring (HeiLT1) share a common recharge water source. (3) Among 9 of 10 studied springs, nitrate concentrations slightly exceed of the drinking water standard (10mg/l).
