The Application Study Of HEC-HMS Model In Eastern Of Wuliangsuhai

With significant changes of the global climate, intensity and frequency of drought and flood disaster continued growth, and it is a necessary precondition that we should study and understand process of water cycle and mechanisms of these changes. Due to kinds of factors effecting with each other, such as underlying surface, climate, soil, land use types, water cycle and so on, the capability of extension application of the hydrological models is restricted. HEC-HMS hydrologic model has many runoff yield model for use, but a lot of applications of this model in humid areas, and is seldom used in arid regions. Therefore, I choose study area in Guangshenglong basin of Wuliangsuhai eastern of Inner Mongolia, and jointly launched field tests and laboratory experiments to analyze hydrological characteristics of watershed, using geographic information system and remote sensing technology to extract drainage network Information and exploring mechanisms of runoff yield. Finally I try to build an Event rainfall-runoff process model based on HEC-HMS hydrologic model and evaluate the model simulation accuracy in arid regions, the main conclusions are as follows:(1) This paper analyzes the annual variability of precipitation and runoff in Gushenglong basin, so as distribution average year from 1986 to 2010. We can see there is a little change about yearly rainfall in watershed, but runoff has a decreasing trend, and both are great annual variability; precipitation and runoff shows an uneven distribution during a year and mainly concentrated in the flood season, the maximum monthly precipitation and runoff take place in July,68.3% and 43.41%, respectively. By analyzing 14 games rainfall runoff process of Guangsheng Basin, known Watershed Runoff Producing mainly based on runoff yield under excess infiltration.The flood sometimes increase and drop rapidly, sometimes increase rapidly and drop slowly, and sometimes increase and drop slowly. The main flood has only a single peak, or a double peak, and it appeared after the rain stopped. The amount of flood is sometimes large and sometime small,and the flood duration is short.(2) Using tools of filling depression, flow analysis, flow accumulation, drainage extraction and division of basin methods by HEC-GeoHMS hydrology module based on Arcview, it is can be analysis and processing a resolution of 30m DEM data and extracted Guangshenglong basin information which is divided into 22 sub-basin.(3) Hydro-meteorological data, land use, soil spatial and attribute data combined with the drainage network are satisfied with the requirement of HEC-HMS hydrologic model. Based on HEC-HMS model providing the platform, the rainfall loss method use SCS curve number, direct runoff method use SCS UH, and river concentration use the Muskingum. Finally it is established about a basin hydrological model.(4) It was selected 14 games rainfall-runoff process from 1986 to 2010 as the research object, and used four indicators for evaluating the accuracy of simulation, including in peak flow relative error (REP), flood volume relative error (REV), the factor of time difference of peak between measured and simulated flood (△T), determination coefficient (DC). It is showed that average REP is 6.70%, REV is 8.83%, average △T is 11.25min, and average DC is 0.79 during calibration period. The average REP is 4.72%, REV is 15.80%, average △T is 28min, and average DC is 0.83 during validation period. It is showed that the accuracy of simulation in Guangshenglong basin by HEC-HMS model is perfect. And the simulation on peak flow volume is better than on the total volume of the flow.