Abstract
The changes of flooding area and surface morphology on a proluvial fan from typical middle-small scale gully in Southwest China were studied under different peak discharges based on large scale of field solid model experiments. The results showed that: in the model fan, 1) the changes of flooding area and surface morphology before and after floods increased with the increases of peak discharges. Most flooding occurred on the concave bank around top rush point, which also made the local surface morphology changed dramatically, i.e. the increases of width-depth ratio of river channel. 2) Buildings on the upper fan less than 20m away from the river bank could be affected seriously by the extreme floods, while the distance on the lower fan was 40m. On the middle part of model fan, buildings less than 10m away from the river bank would suffer disasters under small floods, and the distances were 30m and 80m under middle and extreme floods, respectively.
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