The impact of climate change and water demand on streamflow in the Haihe River basin, China

Authors: Yiming Wang*, Iowa State University, Yuyu Zhou, Iowa State University
Topics: Water Resources and Hydrology, Environmental Science
Keywords: streamflow, climate change, water demand, CWatM
Session Type: Virtual Paper
Day: 4/10/2021
Start / End Time: 8:00 AM / 9:15 AM
Room: Virtual 41
Presentation File: No File Uploaded

The hydrological process is of great significance for water resources planning and management to maintain a healthy ecosystem and society development. Streamflow is a critical element of the hydrological cycle, reduced in the Haihe River basin in the past due to climate change and the growing water demand. In this study, the Community Water Model (CWatM) was used to evaluate the drivers of changes in streamflow under climate change and water demand scenarios. We calibrated CWatM for the historical streamflow at a monthly time step based on the objective function of a modified version of the Kling-Gupta Efficiency (KGE). Finally, we projected future streamflow from 2021 to 2100 using the ensemble of nine CMIP6 GCM outputs. The results indicate that: (1) water use can cause river streamflow to drop by 80% at the outlet of the river basin, and domestic and industrial water use has a greater impact on streamflow compared to irrigation; (2) during the flood season, climate change could increase streamflow at the outlet by about 1.5 times, while climate change has a more significant impact on streamflow during the dry season. The findings from this study are of great help for developing management policies to improve the sustainability of the Haihe River Basin ecosystem.

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