Dynamic evaluation mode for ecological environment in irrigation based on theme classify and component technology

Abstract: To resolve the limitations of traditional method for evaluating ecological environment in the irrigation area, dynamic theme service model was proposed in this paper using information technology. The evaluation themes are identified according to the problems of irrigation area. The dynamical evaluation process of ecological environment in irrigation area based on theme service is established. To build the evaluation indices library and develop the evaluation method component, the appropriate evaluation index is selected from the ecological environment evaluation indices library in the irrigated area according to the evaluation theme. The evaluation index system for specific evaluation theme is established after the optimization of indices. The evaluation theme knowledge map is drawn based on the comprehensive integrated platform and the ecological environment dynamic evaluation system is established. The evaluation methods are determined according to the characteristics of the ecological environment evaluation theme and the evaluation indices system. The corresponding component is invoked from the evaluation method component library to calculate the evaluation indices for different themes, and realize dynamic theme evaluation for the ecologic environment in irrigation area. Taking the Jinghuiqu irrigation area in Shaanxi Province as the study case, 4 evaluation themes including the ecological environment influential factor theme, the resource utilization level theme, the engineering support capacity theme and the sustainability theme are determined based on the investigation situation and concerns of the management department in the irrigation area, and the opinions of the experts. The results showed that the ecological environment in irrigation district was between good and mediocre in 2009 and 2014, and the ecological environment situation of irrigation district decreased in 2014 compared with that in 2009; from 1997 to 2014, the utilization level of irrigation resources increased year by year, and each evaluation index developed to a healthy grade year by year; the support capacity of irrigation district was mediocre in 2014, and it tended to be good; the result of irrigation district sustainability evaluation was good in 2014. As the results show: The service model can achieve dynamic evaluation of ecological environment of irrigation area quickly with multi-angle view, the evaluation result is more credible, so it has more advantages compared to the traditional evaluation method. Using the information technologies, the paper introduces a dynamic evaluation model for the ecological environment in the irrigation area based on the comprehensive integrated platform, and the results of the paper are of great importance for the healthy development of the ecological environment and ecological civilization construction in the irrigation area.