Sediment risk analysis of urban drainage pipeline

The urban water body is an important part of the urban infrastructure, and the urban drainage pipe is the core part of the urban water system, however, heavy metals and nutrients such as nitrogen and phosphorus in the sediments of urban drainage pipes have some risks, so it is important to analyze the risk of sediments in urban drainage pipes. This paper analyzes the risk and harm of sediment in drainage pipeline from three aspects: human health, water ecological safety and water environmental quality, it will lay a foundation for further study on the risk of sediment in drainage pipeline to water environment.

An Evaluation of DEMATEL-EVM based Method for the Demonstration Projects of Water Environment Assessment

The existing methods of the water environmental quality assessment generally focus on the environmental characteristics, and fail to cover the core demands of ecological demonstration project. These methods lack a comprehensive analysis of sustainable development and maintenance capabilities. Also, the subjective analysis and computing of weight furthermore leads to unstable output. This paper is written in attempt to raise a set of assessment systems and methods to evaluate the demonstration projects of water environment. With the helping of establishing a complete quality evaluation index system of water environment demonstration project, the research approaches are based on the model of subjective and objective comprehensive weighting evaluation of DEMATEL-EVM. Through this method, it is able to analyze the key elements scientifically, which influence the water environmental project, finally makes the assessment more convincible.