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| Relative stability analysis of dam system in Xiheidaigou Watershed |
| Fan Ruiyu |
| Soil and Water Conservation Bureau,Shanxi Water Conservancy Department,030002,Taiyuan,China |
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Abstract In order to provide scientific basis for the planning and feasible study,the relative stability of dam system has been studied and analyzed according to the observed data of present control situation in Xiheidaigou watershed and its relative factors which influenced the stability of dam system.The results show that the silted area is one of the basic conditions,but not the sole condition.Judging whether or not dam system has brought about relative stability must satisfy with the concourse of four conditions.There should be 7.8?hm2/km2 of silted land area.The coefficient of relative stability of dam system should reach 1/12.7.After the dam system has been operated for 15 years the dam should be maintained and heightened in each 3 or 5 years so that the dam system's capacity of preventing and controlling flood could be holding or larger than the standard of only once in 100 years.There should be 0.3 main dam and 1.0 check dam within one kilo squire meter.The overall layout and structure of dam system should be rational so that storm flood could be distributed harmoniously.The safety coefficient of dam system should be smaller than 1.After accomplishing the construction target dam system has gotten into the stage of relative stability.Under the flood standard of only once in 100 years,the safety coefficient of dam system（Icp） is equal 0.94,the high stalk crops that have been planted in dam land can harvest.The dam safety and capacity of harvest in dam system can be tending to unify.
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Received: 22 February 2005
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