Ecological Health Evaluation of Dike Interference Area Based on Average Connection Number and Triangular Fuzzy Number

Dike engineering is an effective method for flood control and disaster mitigation. Considering the potential ecological problems such as water loss and soil erosion brought by dike construction,the ecological health evaluation is of important significance to the determination of ecological restoration objectives. Based on the average connection number and triangular fuzzy number,an ecological health evaluation model in dike interference area is proposed. The average connection number is obtained by coupling the connection number based on the discrete value and the connection number dependent on the continuous value. In the optimized connection number expression,triangular fuzzy number is introduced to quantitatively express the difference coefficient,so as to describe the fuzziness between adjacent grades. The application of the proposed model in the typical dike bid sections in the main stream of Amur River shows that the ecological health condition in section 5 is the worst,and the ecological health condition after dike construction in section 1 displays the most evident changes. In addition,effective soil thickness and vegetation coverage rate are the main influencing factors. The model is valuable for popularized application in the ecological health evaluation and ecological restoration guidance on the interference area of the similar water conservancy project construction.