6.The test of the Reynolds Number shows the rill flow pattern is turbulent flow, and the test of the Froude Number shows the rill flow maybe either sub critical flow or supercritical flow.
7.The results indicated that the REE tracer technology has high precision to quantify the spatial-temporal process of soil erosion; In earlier rainfall course, the development degree of sheet and nil erosion was general equation; Otherwise in the following course, the rill erosion was dominant in the total erosion, its average erosion acceleration and the average erosion rate was 15 and 9 times of sheet erosion, respectively; In the end of experiment, the rill erosion took up 90% of total erosion amount; The section of slope bottom occupying about 1/3 slope area was active erosion segment in this experiment.
