Earth Surface Processes and Landforms, Год журнала: 2025, Номер 50(5)
Опубликована: Апрель 1, 2025
Abstract Sedimentation represents a key risk to the world's artificial reservoirs upon which humans rely satisfy vital water needs. Improving our understanding of watershed sediment dynamics is crucial in managing reservoirs, particularly small, high‐standing tropical islands characterized by high yields. This study addresses such need comparing potential contributions from surface erosion on active cropland and rain‐driven shallow landsliding yields an reservoir Puerto Rico for 60‐year period. The relied various data sources including land cover landslide maps, high‐resolution digital elevation databases, long‐term rainfall bathymetric surveys document budget 43.9 km 2 watershed. Results indicate that delivery associated with may explain 47–79% 1,195 Mg −2 yr −1 long‐term, watershed‐scale average yield capable sustaining about 20%. Rainfall not directly cyclones appears be as important related named storms driving mobilization. As declined frequency days sufficient trigger landslides increased through time, relative importance consequently presently 85% rates remain well above background levels. current incidence this mostly forested linked its abundant (~1,980 mm ; ~0.92 triggering rains per year), topographic relief (~90% > 30°) road densities (19.4 ). Most roads are farm access largely represent legacy now abandoned agricultural activities, yet they still induce much slope instability generates significant quantities sediment.
Язык: Английский