Study on Ecological Water Diversion Optimization Based on the One-Dimensional River Network Model – With Wenrui River System in North of Fanyou as an Example

Abstract

Wenrui river system in the north of Fanyou is located in Wenzhou city. In recent years, river water quality has been improved by the implementation of ecological water diversion with the phenomenon of large area of black smelly basically eliminated. But there is still no fundamental improvement in river water environment. In this paper, sluice scheduling, scheduling of water supply and optimized control scheme is studied based on the one-dimensional river network model, on the basis of current situation of ecological operation, through analyzing the characteristics of river water system in north of Fanyou, water source and the distribution of main control sluice. It is turned out that water quality of Wenrui river system in north of Fanyou cannot be comprehensively improved by ecological water diversion and can only be targeted to the important areas and key rivers, due to the large area, complex river net and limited ecological water supply. Pollution reduction is the most fundamental way to improve river water quality. But currently, on the premise of difficultly cutting down complete pollutions, river water quality can be improved to a certain extent by ecological water diversion with Puzhou sluice as the main control sluice, combined with other sluices for joint scheduling. In the future, if pollution load can be reduced and enough water supply can be guaranteed, river water quality can reach class II or III in the key areas along the Ou River and river water in other areas also has different degrees of improvement.