Research To The Laws Of Silt Deposit Of Naodehai Reservoir

The silt problem of reservoir has a direct impact to the service life and comprehensive benefit of reservoir.It may even endanger the dam safety.This situation is more likely to happen to the reservoir that is built on heavy-silt river.This essay takes Naodehai Reservoir as the research object and introduces the general situation of the reservoir that is located in the Liu River basin.It also analyses and reorganizes the hydrologic data as well as the measuring achievement since the foundation of the reservoir.Based on this point,the article shows the changed condition in storage capacity,vertical section,cross section and the average number of grain diameter and silt content since many years ago.The law of natural change is concluded, too.We make scientific researches on operation mode and sand-clearing mode.The practically measured data indicates that the sand-clearing effect is good both in counter-source washing and rain-dropping washing.The Naodehai Reservoir has been maintaining a stable beneficial storage capacity for 30 years.Taking two influential factors(hydrologic stations on the upper and lower reaches) into consideration,we make a forecast to the storage capacity using the BP and RBF neural network based on neural network theory.The result indicates that the forecast accuracy of the two models meets the demand,and they can both be used to forecast the future condition on storage capacity and silt deposit.Using BP network model,we also make a forecast to the storage capacity condition suppose the heaviest flood coming in every 20 years.Naodehai Reservoir is a good example of being researched that is built on the heavy-silt fiver in northern China.The paper has been written to indicate the research achievement both on the law of alluvial silt as well as sand-clearing mode.The neural network model is also included in the scope of our research.The research has significant meaning not only to Naodehai Reservoir,but has theoretical and practical significance on solving alluvial silt problem in northern reservoirs.