4.3 Variation of Flood and Sediment Discharge in the River Basin
The upper and middle reaches of the Qinhe River Basin are geographically characterized by steep gradients, predominantly due to the presence of valleys and mountains. As a result of the low vegetation coverage and intense but brief precipitation, flood-related incidents frequently occur in the downstream urban regions. Rainstorms and floods represent primary driving forces for the transportation of sediments within the basin. Over the years, various water and soil conservation measures have been implemented within the basin, with a focus on water conservancy projects aimed at constructing reservoirs to regulate floods and reduce water and soil loss. In light of these developments, the current study aims to investigate the time-series of flood and sediment discharge and their link to human activities within the basin during the flood season between 1971 and 2000. Furthermore, the study aims to explore the benefits of water and soil loss control, flood control, and disaster prevention within the basin in response to forest and grassland conservation measures, as well as engineering measures.