SPATIO-TEMPORAL VARIATION ANALYSIS OF WATER QUALITY IN SLUICE-CONTROLLED URBAN RIVER BASED ON TWO-STEP CLUSTER

WANG Gang; WO Yubao; MAO Jingqiao; XIAO Yang; PENG Jirong

doi:10.13205/j.hjgc.202201017

Volume 40 Issue 1

Mar. 2022

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WANG Gang, WO Yubao, MAO Jingqiao, XIAO Yang, PENG Jirong. SPATIO-TEMPORAL VARIATION ANALYSIS OF WATER QUALITY IN SLUICE-CONTROLLED URBAN RIVER BASED ON TWO-STEP CLUSTER[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(1): 117-122,160. doi: 10.13205/j.hjgc.202201017

Citation:

WANG Gang, WO Yubao, MAO Jingqiao, XIAO Yang, PENG Jirong. SPATIO-TEMPORAL VARIATION ANALYSIS OF WATER QUALITY IN SLUICE-CONTROLLED URBAN RIVER BASED ON TWO-STEP CLUSTER[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(1): 117-122,160. doi: 10.13205/j.hjgc.202201017

Citation:

WANG Gang, WO Yubao, MAO Jingqiao, XIAO Yang, PENG Jirong. SPATIO-TEMPORAL VARIATION ANALYSIS OF WATER QUALITY IN SLUICE-CONTROLLED URBAN RIVER BASED ON TWO-STEP CLUSTER[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(1): 117-122,160. doi: 10.13205/j.hjgc.202201017

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SPATIO-TEMPORAL VARIATION ANALYSIS OF WATER QUALITY IN SLUICE-CONTROLLED URBAN RIVER BASED ON TWO-STEP CLUSTER

doi: 10.13205/j.hjgc.202201017

1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China;
2. Nanjing Yangtze River Management Bureau, Nanjing 210011, China

Received Date: 2021-04-21
Available Online: 2022-03-30
Publish Date: 2022-03-30

Abstract

Abstract

To explore the spatio-temporal regular variation of water quality in typical sluice-controlled rivers of cities along the Yangtze River, and to provide support for hydro-ecological conservancy and precise regulation, the two-step clustering method was applied to the research on the spatio-temporal variation of water quality in the Nanjing reach of Qinhuai River. The results showed that, in recent years, the Nanjing reach was mainly polluted by nitrogen and phosphorus, and the water quality could be grouped into three types(i.e., Type 1-Better water quality, Type 2-medium water quality, and Type 3-poor water quality). In space, the direction of the river was closely related to the variation trend of water quality. From upstream to downstream, the average annual proportion of Type 3 water body increased from 15% to 38%, along the six sections except the section at the mouth of the Qinhuai River, indicating the gradual increase of water pollution degree. In time, the proportion of Type 3 water body decreased from 31%(2008) to 1%(2015), showing that the water quality continued to improve. In addition, the water quality was better in summer and autumn. To improve the water quality in the sluice-controlled river, the opening frequency of sluice at the mouth of the Qinhuai River could be increased under the premise of ensuring no waterlogging in the urban river, and the intensity of water diversion in winter and spring should be strengthened.
- sluice-controlled river,
- Nanjing reach of Qinhuai River,
- water quality,
- spatio-temporal variation,
- two-step cluster

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References(22)

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