冲积河流河床演变的滞后响应模型-Ⅱ模型应用

采用三门峡库区累计淤积量、潼关高程、黄河下游高村站平滩面积和利津站平滩流量、科罗拉多河建库后的下游河床冲刷、密苏里河建库后的下游河道展宽以及图尔特北叉河在圣海伦火山爆发后的河床升降资料,对前文建立的滞后响应模型的三种计算模式,包括通用积分模式、单步解析模式和多步递推模式的合理性和适用性进行了检验。三种计算模式的计算结果与实测值均吻合较好,表明滞后响应模型能够很好地描述河床演变中存在的滞后响应现象和前期累计影响,对定量研究冲积河流河床演变的滞后响应具有重要的理论意义和实际价值。

Delayed response model for fluvial processes of alluvial rivers-Ⅱmodel applications

Three delayed response calculation methods were tested based on data of the accumulated volume of sediment deposition in Sanmenxia Reservoir,the elevation of Tongguan,the bankfull area at Gaocun and the bankfull discharge at Lijin on the Lower Yellow River,the channel degradation of Colorado River after dam closure,channel widening of Missouri River after dam closure,and the channel aggradation and degradation of North Fork Toutle River after the eruption of Mount St.Helens.These three methods include the general integration method,the single-step analytical solution method,and the multistep iterative method,which were developed in earlier in the accompanying paper.Results calculated using the three delayed response calculation methods are in good agreement with measurements,which indicated that the delayed response model can describe both the delayed phenomenon and the accumulative effect that occur in fluvial processes.These methods are of theoretical merit and practical importance for quantitatively studying delayed response for fluvial processes of alluvial rivers.