| Cite this article: | 谷少委,刘杰云,范习超,等.广利灌区总 干渠水质及氮磷污染评价初步研究[J].灌溉排水学报,0,():-. |
| GU Shao-wei,LIU Jie-yun,FAN Xi-chao,et al.广利灌区总 干渠水质及氮磷污染评价初步研究[J].灌溉排水学报,0,():-. |
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| Preliminary Study on Evaluation of Water Quality and Nitrogen and Phosphorus Pollution in Main Canal of Guangli Irrigation District |
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GU Shao-wei1, LIU Jie-yun2, FAN Xi-chao2, QIN Jing-tao2, ZHONG Zhi-bo2, LYU Mou-chao1, gaojianmin3
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1.Farmland Irrigation Research Institute,Chinese Academy of Agricultural Institute/ Key Laboratory of Water-Saving Irrigation Engineering,Ministry of Agriculture and Rural Affairs;2.Farmland Irrigation Research Institute,Chinese Academy of Agricultural Institute;3.Lianyungang City Tongyu River North Extension Water Project Management Office
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| Abstract: |
| 【Objective】In view of the serious challenges faced by the green development of irrigation districts and the continuous deterioration of the water environment, the status of the main canal water quality and nitrogen and phosphorus pollution in Guangli Irrigation District and its impact on the water environment of the irrigation district were explored, and further suggestions for solving the water environment problems.【Method】From June 2019 to December 2019, six representative sections of the main canal in the irrigation area were selected and water quality monitoring was conducted six times to determine the total amount of Nitrogen (TN), total phosphorus (TP), CODCr and BOD5 in the water body, which can be measure of water quality and nitrogen and phosphorus pollution, use the comprehensive water quality identification index suitable comprehensive evaluation of domestic river water quality, and the power function in logarithm form Universal Index Formula of eutrophication Assessment to analyze river water quality and eutrophication.【Result】Result 1. According to the comprehensive water quality identification index, 86% of the water quality of Guangli Irrigation District can meet the water requirements of the type V agricultural water functional area, and the comprehensive water quality index changes with time and space significantly, 66.7% of the water body was reduced to sub grade five, and black and odorous water bodies appeared at gate 3 and source supply intake sampling point in July. Result 2, the eutrophication of Guangli Irrigation District is serious,100% of the water in Guangli Irrigation District is in eutrophic state, the peak value of eutrophication evaluation index (EI) appears at the source supply intake in July at 80.5, and 41.6% of the water body is in serious entrophication. Result 3. The average mass concentration of TN is 5.30 mg / L, which is 2.65 times of the standard for surface water type V. the average mass concentration of TP is 0.156 mg/L, and the ratio of nitrogen to phosphorus was 33.97: 1, which is suitable for algae growth.【Conclusion】The overall water quality of Guangli Irrigation District can meet the water requirements of agricultural functional areas, but the level of eutrophication is high, especially the serious nitrogen pollution. The original ecological earth canals and aquatic plants in the irrigation area make the river have a good self-purification ability and can play its ecological function. Therefore, it is recommended to strengthen the pollution control of the water body entering the irrigation area, especially the monitoring of nitrogen and phosphorus pollution; at the same time, the channel lining should consider the ecological environment, the matching ecological lining and the original ecological canal, river channel with aquatic plants, and then adsorb the pollutants such as nitrogen and phosphorus in the river water to improve the water environment of the irrigation district. |
| Key words: Guangli Irrigation District; main canal ,water quality; nitrogen and phosphorus pollution; eutrophication |
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