RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (06): 925-936.doi: 10.11870/cjlyzyyhj201706015

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TREND STUDY OF WATER QUALITY IN THE THREE GORGES RESERVOIR

ZHUO Hai-hua, WU Yun-li, LIU Min-xuan, ZHENG Hong-yan, LAN Jing   

  1. Yangtze Valley Water Environment Monitoring Center, Wuhan 430010, China
  • Received:2016-11-02 Revised:2017-01-22 Online:2017-06-20
  • Supported by:
    Foundation Program of Three Gorges Reservoir Operation and MaintenanceManagement of The Three Gorges Project Construction Committee of the State Council;Key Program on WaterResources Development and Utilization

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Abstract: Water quality of the Three Gorges Reservoir from 2000–2015 was analyzed, in order to investigate the trends of water quality parameters and the relationship between the key pollutants such as suspended substance(SS), potassium permanganate index (CODMn), and total phosphorus (TP) from the Three Gorges Reservoir storing up to 175 m. Results revealed a good water quality in the area of the mainstream of the Three Gorges Reservoir and a less pronounced influence by the reservoir scheduling. The observed trends differed among the monitoring sections along the mainstream owing to the change of hydrologic character, upland water, branch inflow as well as non-point and point sources pollution resulted from the impoundment. The proportion of evaluation results of water quality that better than Class Ⅲ was increasing in the whole reservoir except the Qingxichang and Tuokou sections. Influenced by impoundment, water quality declining was found in Yulinhekou, Xiaojianghekou, Daninghekou and Xiangxihekou sections. Although a good correlation between the SS concentration and the period was observed for the upland water of the Three Gorges Reservoir, SS concentration was reduced during each period since 2013, which resulted in a reduction about of 80% for SS flux. SS concentration was decreased temporally during the high-flow period and normal-flow period in both the center and head region of the reservoir, but was stable during the low-flow period. After the impoundment, a lower value of SS was usually found in the main branches estuary compared with that in the mainstream of the reservoir at the same time. Meanwhile, the value of SS in the upper branches estuary was influenced by the flow period more obviously than that in the middle and lower branches of the reservoir. CODMn and TP differed significantly among different periods. During the high-flow period, the variation of CODMn and TP in the upstream sections was obviously than that in the downstream sections. After impoundment, CODMn and TP showed no significant differences among the periods and sections. Limited correlation was observed between SS, CODMn and TP, however, the results cannot be derived from the detect value of one sample in a long time.

Key words: water quality, trends, Three Gorges Reservoir, water storage

CLC Number: 

  • X824
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