Abstract
Evaluation to flood disaster is very difficult due to the uncertainties and complexity of multiple related evaluation indexes. In view of building SPA model and considering the standards for grades of the ambiguity of the border, the comprehensive weight was calculated and the confidence criterion was introduced, which explores a new way of flood risk evaluation based on GIS technology. Flood risk assessment map of Beijiang River basin was acquired with SPA model. Compared with a few historical large floods, the results could better reflect the actual situation, which validates the rationality of the presented model.
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