The aquatic ecosystems are closely correlated with the water cycle in a river basin. The large-scale water resources and utilization in the Haihe River basin have altered the natural water cycle, thus resulting in the overall degradation of the aquatic ecosystems in the river basin. The South-to-North Water Transfer Project may transfer water from the Yangtze River to the Haihe River basin, thus increasing flux of the water cycle and influencing the ecosystems in the river basin. This paper develops a metho...