The Relationship between Vegetation Changes and Cut-offs in the Lower Yellow River Based on Satellite and Ground Data

概要

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Absences of water flow (cut-offs) have occurred frequently since 1972 in the Yellow River, China. Satellite and ground data were used to determine the causes and to understand the river's present state. Actual conditions of river flow/cut-offs were analyzed by means of ground data. Fluctuation trends of the average NDVI for 20 years were obtained from satellite data over the study area. Relationships between the flow/cut-offs of the Yellow River obtained from ground data and NDVI change in the lower reaches of the river obtained from satellite data were analyzed as was the relationship between changing NDVI and precipitation (or temperature). Multiple regression analyses of cut-offs that used predictor variables of the average NDVI, precipitation, and temperature also were performed. The absence of water flow (cut-off) was assumed to be caused by marked water intake from the Yellow River as a result of the increased area for the cultivation of wheat.
日本自然災害学会の論文