Study on Environmental Flow in Beijing Section of Yongding River
Abstract: The Beijing section of Yongding River is an artificial rebuilt river. The environment flow study is of great significance on ecology and environment rebuilt in a polluted watershed and river course. The principle of environment flow in an artificial river is studied in this paper. First of all, the ecological goal theory and specific ecological objectives are studied for different purposes. This paper indicates that environmental flow in an artificial rebuilt river includes ecological base flow, water evaporation and infiltration in the artificial river and lakes, and water demand of the riverside plants. In this research, the natural river course is abstracted and generalized based on specific requirements of different sections of natural river course and artificial river bed; the artificial river cross-section is designed subsequently. Furthermore, this paper has divided the content of consumptive and non-consumptive environmental flow. Based on the ecological targets decided, research result of the consumptive and non-consumptive environmental flow is calculated in the case study as follows: 1) the ecological base flow of the gorges section and the plain section is 0.79 - 4.75 × 108 m3 under the basis of the lowest to best target; normally the main course flow is included only in the low objective and some tributary environment flow could be also included in the higher objective; 2) the consumptive water demand of the urban plain section and rural plain section is 2.81 - 9.17 × 107 m3 under different ecological targets, among which the water demand for evaporation and infiltration of the artificial river and lake is 3.40 - 5.87 × 107 m3; the water demand for riverside plant is 3.30 × 107 m3 for different ecological targets. The research indicates that the environmental flow of the artificial rebuilt river is related to the transect of the river, the roughness of the river course, the ratio of longitudinal slope, and the seepage prevention works in the course. In the case of water limitation, the above factors could be adjusted to regulate environmental flow for proper ecological targets.
文章引用: 张士锋 , 刘晓菲 , 李 瑞 , 康德勇 (2016) 永定河北京段生态需水量研究。 水资源研究， 5， 108-119. doi: 10.12677/JWRR.2016.52014
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