Dynamic simulation of river water environmental capacity based on the subsection summation model.

Abstract

There are noteworthy problems in current strategies to calculate river water environmental capacity (WEC), including the generalization of tributaries and water intakes, which results in inaccurate calculation results of the WEC, and the difficulty in adapting to dynamic changes in demands and hydrological conditions in terms of practical application. To address these flaws, the subsection summation model (SSM) was built for river WEC calculation. The SSM increases the number of control sections according to drain outlets, water intakes, and tributaries and acquires the WEC of the functional area section by section. The Wei River was taken as the study area for verification and application of the SSM. Supported by a comprehensive integration platform, the WEC simulation system of the Wei River was constructed. The results show that the SSM enhances the accuracy of the WEC calculation, and the results are closer to the actual situation. The simulation system could obtain the WEC according to the demands and changes in the hydrological conditions, thus providing technical means for policymakers. PRACTITIONER POINTS: The subsection summation model provides a more accurate water environmental capacity (WEC) calculation method considering tributaries and water intakes avoiding generalization. The simulation system should be established to make the WEC calculation adapt to the demands or changes in the hydrological conditions. The model and system could supply the basis and technical means for decision-making.