| Cite this article: | 侯恩光,张升第,王如岩,等.大汶河流域泰安段水质变化及其与水量响应关系研究[J].灌溉排水学报,0,():-. |
| HOU En-guang,ZHANG Sheng-di,WANG Ru-yan,et al.大汶河流域泰安段水质变化及其与水量响应关系研究[J].灌溉排水学报,0,():-. |
|
| |
|
|
| This article has been：Browse 1187Times Download 0Times |
|
|
|
| DOI： |
|
| Study on Water Quality Change and its Relationship with Water Quantity in Tai’an Section of Dawen River Basin |
|
HOU En-guang1, ZHANG Sheng-di1, WANG Ru-yan1, ZHANG Chun-xia1, YANG Hui-qing1, DUAN Jian-zhu1, GAO Zhen-yong2, TAN Xiu-cui2
|
|
1.Hydrological Bureau of Taian City,Tai’an;2.Shandong Agricultural University,Tai’an
|
| Abstract: |
| 【Background】Water quality and water quantity are the dual attributes of water resources, and there is a close relationship between them. In general, water quality changes of the river are caused by water quantity over different periods. 【Objective】The objective is to study the response relationship between water quantity and quality in Tai’an section of Dawen River Basin, and formulate scientific and reasonable water pollution control strategies. 【Method】Based on the monthly measured data of 7 water quality stations and 1 hydrology station in Tai’an section of Dawen River Basin, the seasonal Kendall test method was used to analyze the trend of water quality, and the Copula function was used to construct the two-dimensional and three-dimensional joint distribution of water quantity and water quality. 【Result】During 2010-2019, the concentrations of COD and NH3-N showed a downward trend in Tai’an section of Dawen River Basin. Seasonal Kendall test showed that 71% of the evaluation results were a highly significant downward trend. From upstream to downstream, the concentrations of COD and NH3-N showed a downward trend. In Dawenkou station, the relationship between flow and water quality showed that from non-flood season to flood season, the concentrations of COD and NH3-N decreased by 6% and 37% respectively, and the month’s proportion of reaching class IV water standards increased by 10%. The two-dimensional joint distribution of flow and water quality based on Frank Copula function shows that the joint probability increases with the increase of flow and water concentration. When the joint probability is constant, the water quality concentration decreases with the increase of flow and tends to be stable. The occurrence probability of water quality concentration of each index under any flow can be determined according to the contour map. The three-dimensional joint distribution of precipitation, flow and water quality based on Clayton Copula function shows that when the joint probability value is less than 0.6, with the increase of precipitation, flow and water quality concentration, the joint probability value increases, mainly along the direction of flow increase. When the joint probability value is greater than 0.6, the evolution trend of three-dimensional joint probability of COD and NH3-N changes. 【Conclusion】There is a close relationship between water quantity and water quality in Tai’an section of Dawen River Basin. Copula function is suitable for constructing the joint distribution of water quantity and water quality in Tai’an section of Dawen River Basin. |
| Key words: Dawen River Basin; water quality; water quantity; two-dimensional copula joint distribution; three-dimensional copula joint distribution |
|
|
|
|
|
|
