River System Health Comprehensive Evaluation of Qilihe in Zhengzhou

In order to solve the problem of health status evaluation after Qilihe water system ecological management, put forward water system health definition, namely in a certain context, river system water quality is up to standard, the water surfer rate is suitable, the structure is perfect and reasonable, hydrologic situation is nature, the main functions are all normal, anti-interference performance is strong, ecological system is favorable, and river system is adapted to its environment and socio-economic characteristics, can maintain its sustainable development and its service society properly, can also act as a benchmark system for the river system and a particular state of health management goals. Based on the river system health definition, five first grade health indexes are selected namely hydrological condition, water environment condition, morphological structure and landscape condition, the condition of service function and water ecological status to construct the health evaluation index system of Qilihe river system which has 15 secondary indexes. The cloud evaluation model is used to evaluate river system health of Qilihe based on the analytic hierarchy process to determine weight of index. The result is showed that the evaluating value of Qilihe river system before the ecological management is 0.529, in the state of sub-health and the value after the ecological management is 0.645, in the state of health. Furthermore, the main influence factors of Qilihe river system health are the coastwise crowd’s satisfaction, flood control capacity, the changing rate of annual average water, the water quality standard rate of water functional area, water resources control and dispatch ability and landscape diversity. It is suggested that Qilihe river system ecological management measures including the engineering technology and the gates and dam eco-dispatching are reasonable and effective.