Effects of different soil and water conservation measures on hydrological extremes and flood processes in the Yanhe River, Loess Plateau, China

ChaoJun Gu (), Yongqing Zhu, Renhua Li, He Yao and Xingmin Mu
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ChaoJun Gu: Yangtze River Basin Monitoring Center Station for Soil and Water Conservation, Changjiang Water Resources Commission
Yongqing Zhu: Yangtze River Basin Monitoring Center Station for Soil and Water Conservation, Changjiang Water Resources Commission
Renhua Li: Yangtze River Basin Monitoring Center Station for Soil and Water Conservation, Changjiang Water Resources Commission
He Yao: Yangtze River Basin Monitoring Center Station for Soil and Water Conservation, Changjiang Water Resources Commission
Xingmin Mu: Northwest A&F University

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2021, vol. 109, issue 1, No 24, 545-566

Abstract: Abstract The runoff and sediment load of the Loess Plateau have changed significantly due to the implementation of soil and water conservation measures since the 1970s. However, the effects of soil and water conservation measures on hydrological extremes have rarely been considered. In this study, we investigated the variations in hydrological extremes and flood processes during different periods in the Yanhe River Basin (a tributary of the Loess Plateau) based on the daily mean runoff and 117 flood event data from 1956 to 2013. The study periods were divided into reference period (1956–1969), engineering measures period (1970–1995), and biological control measures period (1996–2013) according to the change points of the annual streamflow and the actual human activity in the basin. The results of the hydrological high extremes (HF1max, HF3max, HF7max) exhibit a decreasing trend (P 80%), whereas decreased during the biological control measures period at almost all frequencies. The hydrological low extremes generally increased during both the engineering measures and biological control measures periods, particularly during the latter period. At the flood event scale, most flood event indices in connection with the runoff and sediment during the engineering measures period were significantly higher than those during the biological control measures period. The above results indicate that the ability to withstand hydrological extremes for the biological control measures was greater than that for the engineering measures in the studied basin. This work reveals the effects of different soil and water conservation measures on hydrological extremes in a typical basin of the Loess Plateau and hence can provide a useful reference for regional soil erosion control and disaster prevention policy-making.

Keywords: Hydrological extremes; Soil and water conservation; Flood events; Yanhe River Basin (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s11069-021-04848-w

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