我国南方分层水库水位下降对水质特征的影响

刘斯璇; 李一平; 朱雅; 魏尧; 李荣辉; 王璨; 陈宇; 彭燕莉; 梁丹

doi:10.13205/j.hjgc.202305024

我国南方分层水库水位下降对水质特征的影响

doi: 10.13205/j.hjgc.202305024

刘斯璇¹,
李一平^1,2, ,,
朱雅¹,
魏尧¹,
李荣辉³,
王璨¹,
陈宇¹,
彭燕莉⁴,
梁丹⁴

1. 河海大学环境学院, 南京 210098;
2. 河海大学浅水湖泊综合治理与资源开发教育部重点实验室, 南京 210098;
3. 广西壮族自治区水利科学研究院, 南宁 530023;
4. 广西水利电力职业技术学院, 南宁 530023

基金项目:

中央高校建设世界一流大学(学科)和特色发展引导专项资金资助

国家自然科学基金资助项目(52039003,51779072)

中央高校基本科研业务费专项资金资助(B200204014)

详细信息

作者简介:
刘斯璇(1998-),男,硕士研究生,主要研究方向为湖库富营养化。905860321@qq.com

通讯作者:
李一平(1978-),男,教授,主要研究方向为水环境治理与保护。liyiping@hhu.edu.cn

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出版历程
- 收稿日期: 2022-04-30

INFLUENCE OF WATER LEVEL DESCENDING OF LAYERED RESERVOIRS ON WATER QUALITY CHARACTERISTICS IN SOUTH CHINA

LIU Sixuan¹,
LI Yiping^{1,2
, ,},
ZHU Ya¹,
WEI Yao¹,
LI Ronghui³,
WANG Can¹,
CHEN Yu¹,
PENG Yanli⁴,
LIANG Dan⁴

1. College of Environment, Hohai University, Nanjing 210098, China;
2. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China;
3. Guangxi Water Conservancy Science Research Institute, Nanning 530023, China;
4. Guangxi Vocational College of Water Resources and Electric Power, Nanning 530023, China

摘要

摘要: 近年来,广西中小型水库水位持续下降,突发性泛黑现象造成的水质问题引起了研究者的广泛关注,为探讨致黑关键因子铁(Fe)、锰(Mn)及硫化物在低水位运行状态下的迁移转化规律,充分运用2018—2021年的气象水文、水质数据等资料,结合低水位期长期分层采样数据,得出以下结论:入库流量长期低于出库流量导致水库蓄水量减少,低频低量降雨是水位持续走低的重要原因;低水位下热分层期底层水体平均溶解氧含量为1.79 mg/L,混合深度与水深比值随季节更替变化,水位越低(浅水区)越易达到完全混合状态;低水位促进水体Fe、Mn浓度增加(4.28,5.41 mg/L),分别达到2018年的3.67,3.68倍,加剧了沉积物污染释放;泛黑现象出现区域差异性,横向理化性质差异和污染物迁移是其重要原因,混合期和分层期季节性交替形成的水体环境是Fe、Mn蓄积及其迁移转化的关键驱动因素。
- 低水位 /
- 溶解氧 /
- 横向规律 /
- 铁 /
- 锰
Abstract: In recent years, the water level of reservoirs in Guangxi continued to decline. Water quality problems caused by the sudden blackening phenomenon attracted widespread attention. In order to explore the migration and transformation law of iron, manganese and sulfide under the low water level, we comprehensively investigated and analyzed meteorological, hydrological, and water quality data from 2018 to 2021 and continuous sampling data during the low water level period. The results showed that long-term inflow led to a decrease in the reservoir storage capacity. Water level fluctuation was mainly affected by low-frequency and low-volume rainfall. The average dissolved oxygen concentration of the bottom water in the thermal stratification period was 1.79 mg/L when the water depth descended to about 11 meters. Mixing depth of low water level area was closely related to completely mixed. Further analysis results indicate that the water level declining promoted the increase of Fe and Mn concentrations (4.28 mg/L and 5.41 mg/L), reaching 3.67, 3.68 times that of 2018. Horizontal physical and chemical property differences and the migration of pollutants occurred by thermal stratification led to the deterioration of water quality. In general, the blackening phenomenon presented regional differences. Seasonal alternation of the mixing period and stratification period is the driving factor for the accumulation, migration and transformation of Fe and Mn.
- low water level /
- dissolved oxygen /
- transverse law /
- iron /
- manganese

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