Changes in Runoff Generation Patterns in the Hilly-Gully Region of the Loess Plateau Under Vegetation Restoration
Understanding the mechanisms and patterns of runoff generation in watersheds is fundamental to building hydrological and soil ero-sion models.It also provides important guidance for watershed water resources management and rational utilization.In order to reveal the in-fluence of vegetation restoration on the runoff production mechanism and model of the Loess Plateau,the Dongzhuanggou watershed,which is dominated by natural grassland restoration,and the Yangjiagou watershed,which is dominated by afforestation restorationin in the gullied lo-ess plateaus were taken as research areas.The flood process lines and regression curves of two contrasting small catchments under different rainfall types were analyzed,and the change of runoff production pattern in the gullied region of loess plateau under vegetation restoration was studied.The results indicate that with the restoration of the watershed's vegetation and its eco-hydrological functions in these small water-sheds,annual runoff generation capacity decreases,while water retention capacity increases.Vegetation restoration effectively reduces peak flow and prolongs flood duration,especially the recession period of the flood,thereby achieving the effect of flood mitigation.Under the influ-ence of vegetation restoration,the runoff generation pattern tends to shift from the traditional infiltration-excess runoff pattern to a shallow sub-surface saturation runoff pattern.This change demonstrates that vegetation restoration can effectively mitigate floods and thus play a significant role in flood control and disaster reduction.Additionally,it can efficiently transform generalized precipitation resources into soil water and in-terflow,regulate the seasonal distribution of streamflow,increase ecological water use,and promote the healthy and stable development of vegetation ecosystems in semi-arid areas.
vegetation restorationrunoff generation mechanismssoil and water conservationecohydrologyLoess Plateau
国家科技期刊平台
NSTL
万方数据
