Research in the calculation of the debris flow prevention and Geographic Information System control engineering

摘要

Currently, it is very hard and low effective to collect watershed characteristic data when calculatingrndebris flow to prevent and control it. This article identifies that the optimum resolution in thernstudy area is 10 m in digital elevation model. And on the base of this, using the MATLAB digitalrnsoftware has implemented the relatively new “three‐direction algorithm” to fill the bottom landrnand has extinguished the phenomenon of river “parallel” in the traditional calculation. It is goodrnat keeping the original terrain information and successfully builds up the hydrologically correctrndigital elevation model. Extracting the water network and related watershed parameters, afterrnorganic combination treatment, and combining with the feature of debris flow in the study area,rna point of prevention and control project is set up at the upstream of Subao River. Using GeographicrnInformation System technology, we have achieved to extracting the data of the debrisrnflow valley area F, main gully length L, and the main gully bed average longitudinal shrinking slopernJ, automatically, rapidly, and accurately. In the MATLAB platform, we design an automatic algorithmrnto calculate the flood peak flow and debris flow peak flow in rainstorm. Combining withrnthe practical situation of the study area, it can finally calculate the debris flow.