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Assessment of potential maximum erosion and sediment disaster risk of typhoon events

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  • Wen-Yan Zhang

    (Nantou Branch, Soil and Water Conservation Bureau, Council of Agriculture)

Abstract

This study investigated the degree to which typhoon-induced sediment yield and sediment disasters in catchment areas affected the environment, using hydrological data (i.e., runoff and sediment yield data) from 1999 to 2009 to establish an R–S rating curve and determine the typhoon-induced sediment yield. This study is innovative in that (1) it used the R–S rating curve to verify the relationship between potential maximum retention (S) and sediment yield from typhoon events and (2) it projected the potential maximum erosion (A) of typhoon events on the basis of S and SY and verified the catchment areas at risk of sediment disasters by employing the concept of environmental risk. The results revealed that different amounts of cumulative rainfall from typhoon events corresponded to different S–SY functions. Cumulative rainfall was categorized into three types. Type I was less than 197.2 mm and susceptible to environmental factors with no corresponding function. Type II was 197.2–754.4 mm, and the corresponding function was SY = 473.64S−0.866 (R2 = 0.71). Type III was 754.4–1419.7 mm, and the corresponding function was SY = 13764S−1.133 (R2 = 0.92). Regarding sediment disaster risk, satisfactory results were obtained from comparing the risk levels and actual landslide data. Therefore, the results regarding sediment yield and estimated risk of sediment disaster verified the feasibility of the proposed research method.

Suggested Citation

  • Wen-Yan Zhang, 2023. "Assessment of potential maximum erosion and sediment disaster risk of typhoon events," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 115(3), pages 2257-2278, February.
    • Handle: RePEc:spr:nathaz:v:115:y:2023:i:3:d:10.1007_s11069-022-05637-9
    DOI: 10.1007/s11069-022-05637-9
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