Sediment Yield From Small Semiarid Watersheds
نویسنده
چکیده
Small watershed sediment yield data were evaluated for eight small watersheds ranging from 35.2 to 159.5 ha within the United States Department of Agriculture – Agricultural Research Service Walnut Gulch Experimental Watershed (WGEW) in southeastern Arizona, USA. Stock pond sediment accumulation measurements covering time periods from 30 to 47 years were combined with water level records and estimates of sediment transported in pond overflows to compute average annual sediment yields. Within the 150 km sq WGEW, sediment yield from upland watersheds ranged from 0.6 t·ha·yr to 3.7 t·ha·yr. Sediment yields were temporally and spatially variable, which adds to the complexity of generalizing sediment yield rates across semiarid regions.
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