【摘要】 针对影响堰塞坝溃坝洪水的主要因素制定室内水槽试验方案,分析入库流量、坝体物质组成、坝后坡度、坝顶长度及开槽宽度等5种因素对堰塞坝溃坝洪水的影响,采用水位计量测坝前库水位,根据水库水量动态平衡方程计算溃口下泄流量,通过对各种影响因素不同工况下的溃口流量过程线进行比较分析,得出规律如下:堰塞坝的入库流量和坝后坡度与最大洪峰流量正相关,与峰现时间反相关;坝体粗沙含量及坝顶长度与最大洪峰流量反相关,与峰现时间正相关;坝顶开槽宽度与最大洪峰流量及峰现时间反相关。更多还原

【Abstract】 Schemes for the laboratory flume tests were prepared for the main influence factors for dam-break flood of barrier dams.The influences of 5 kinds of factors on the dam-break flood were analyzed,that is,incident discharge of reservoir,composition of dam materials,downstream slope of dam,length of dam crest and width of excavated channel.The water levels of the dam before dam-break were measured by use of water gauges,and the flow discharges through the breach were calculated by the dynamic balance equation for reservoir water.The hydrographs of flow discharges through the breach under working conditions of various factors were compared and analyzed.A conclusion is drawn as follows: the incident discharge and the downstream slope of barrier dam are positively related to the maximum peak discharge and are negatively to the peak time;the amount of coarse sand and the length of dam crest are negatively related to the maximum peak discharge and positively to the peak time;the width of excavated channel is negatively related to both the maximum peak discharge and the peak time.更多还原