Optimized design model for sediment-trapped dam by GIS techniques

摘要

The sediment-trapped dam (STD) is one of the major engineering measures in preventing debris flow, while the design of such an STD has been proven as the most complicated systematic engineering. Supported by geographical information system (GIS) method and techniques, this paper presents an optimized STD design model which is built through calculating STD height and reservoir capacity, designing cross section, analyzing load capacity and structural stability. Guided by a principle of taking both the stability of STD as the constraint condition and the optimized design as a nonlinear programming, this model makes it possible for a precise calculation of the STD volume and its reservoir capacity, aiming at getting the minimum ratio between project investment and reservoir capacity. This model preliminarily achieves the optimized designing of important parameters of STD involving in STD volume (project investment), dam stability and reservoir capacity (sediments trapped by STD), and also provides a new solution attempting for the optimized design of project in preventing debris flow.