The Study Of Technology And Method Of Flood Forecast And Dispatching In Zhangwei South Canal Drainage Area

Located in the north of China, Zhangwei south canal drainage area belongs to typical mainland monsoon climate, the rainfall displays an uneven characteristic, mainly focus on summer. Due to the uneven characteristics of rainfall, the flood disease occurs frequently in history. Consideration from the view of flood control and benefit promoting, the Xin'anjiang three-water sources model and experiential model correlating the rainfall and runoff were introduced to study the technology and method of flood forecast and dispatching in Zhangwei south canal drainage area, then the flood forecast and dispatching scheme in this area was obtained through comprehensive analysis of forecast results. Meanwhile, the study method could be use for reference when studying the flood forecast and dispatching in semiarid area.The following achievements could be concluded: (l)Zhangwei south canal drainage area is semiarid area, and two models with different rainfall producing mechanism display little difference in simulation result sof this drainage area, which shows that the rainfall producing manners are not sole, possibly two manners exists together. From the forecast process and analysis of factors affecting the results, one of the main reasons is that human activity in this area changes obviously the natural conditions, and results complicated runoff producing and confluence phenomenon, therefore, certain runoff producing model can not be applied commonly. (2) From the forecast result, it can be seen that the forecast results did not agree well with the measure data, which is the common existing problem in semiarid area. Therefore, it has many works to do to improve the flood forecast method, including the innovation of data and method.