Mass balance of saline lakes considering inflow loads of rivers and groundwater: the case of Lake Issyk-Kul, Central Asia
Mass balance of saline lakes considering inflow loads of rivers and groundwater: the case of Lake Issyk-Kul, Central Asia
复制标题
考虑河流和地下水流入负荷的盐湖质量平衡：以中亚伊塞克湖为例
DOI：
10.1007/s40333-021-0026-0
复制
发表时间：
2021
影响因子：
3
通讯作者：
Okubo Kenji
中科院分区：
文献类型：
--
作者：
Saitoh Kei;Satylkanov Rysbek;Okubo Kenji
本研究的目的是阐明入湖水对盐湖的盐度浓度过程和质量平衡的伊塞克湖，在吉尔吉斯斯坦的构造咸水湖的影响。根据2012 - 2015年的调查结果和气象资料，分析了由于进水引起的溶解化学成分负荷。在此基础上，讨论了盐度增加与入湖水量的关系。通过水质分析数据，采用水槽模型估算河道来水量，通过L-Q曲线分析负荷。根据30 a来湖水盐度的年平均增长量估算了地下水负荷。研究结果表明，伊塞克湖在公元1500年至1800年之间，当一条流出的河流存在时，伊塞克湖暂时变淡，此后，它在公元1800年成为一个封闭的湖泊，并继续保持盐湖直到现在。导致盐碱化的化学成分来自集水区的河流和地下水，当它们流入湖泊时，Ca 2+和Mg 2+以CaCO 3和MgCO 3的形式沉淀。这些化合物被证实是以蒸发岩的形式留在湖岸上的。模型分析表明，每年有1.67 mg/L的Ca ~（2+）和Mg ~（2+）从河流和地下水中以蒸发岩和其他形式沉淀下来。另一方面，湖水中的盐度继续保持在每年27.5毫克/升的速度。这些是伊塞克湖盐度增加的主要原因。由于Na+和Cl−被认为来自地热水，因此无论人类活动如何影响，它们都会继续流入。因此，只要这些成分在作为封闭湖泊的伊塞克湖中积累，未来盐度将继续增加。
This study aimed to elucidate the influence of inflow water on the salinity concentration process of a saline lake and the mass balance of Lake Issyk-Kul, a tectonic saltwater lake in Kyrgyzstan. Based on the survey results and meteorological data from 2012 to 2015, we analyzed the dissolved chemical composition loads due to water inflow. Then, we discussed the relationship between the increase in salinity and water inflow into the lake. Through the water quality analysis data, we used the tank model to estimate the river inflow and analyze the loads by the L-Q curve. The groundwater loads were then estimated from the average annual increase in salinity of the lake over a period of 30 a. The results suggest that Lake Issyk-Kul was temporarily freshened between about AD 1500 and 1800 when an outflowing river existed, and thereafter, it became a closed lake in AD 1800 and continued to remain a saline lake until present. The chemical components that cause salinization are supplied from the rivers and groundwater in the catchment area, and when they flow into the lake, Ca2+,and Mg2+precipitate as CaCO3and MgCO3. These compounds were confirmed to have been left on the lakeshore as evaporite. The model analysis showed that 1.67 mg/L of Ca2+and Mg2+supplied from rivers and groundwater are precipitated as evaporite and in other forms per year. On the other hand, salinity continues to remain in the lake water at a rate of 27.5 mg/L per year. These are the main causes of increased salinity in Lake Issyk-Kul. Since Na+and Cl−are considered to be derived from geothermal water, they will continue to flow in regardless of the effects of human activities. Therefore, as long as these components are accumulated in Lake Issyk-Kul as a closed lake, the salinity will continue to increase in the future.