| Summary: | 碩士 === 國立臺灣大學 === 農業工程學研究所 === 65 === In this study one dimensional model of unsteady flow is set up under the conditions that various drainage cases and possible layouts of drainage system are combined and the boundary conditions and junction conditions are analyzed. The model is used to simulate the inundated conditions for different sections of designed channel of regional drainage planning area under various storm frequencies.
By applying the principle of specified time intervals of characteristics method, one dimensional unsteady continuity equation and momentum equation are expressed in numerical forms and set into computer programs as solving hydraulic routing in naturally drainage channel. At the drainage gates where the lateral channels join the main channel, the hydrological equation and gate equation are used according to the water balance concept for comptuting the storage of every time step. The inundated elevation and area are thus determined, the relation curves of inundated duration - elevation - area can also be plotted. The curves can be used to estimate the drainage loss due to suffering from inundation.
After being applied to the drainge planning of the basin of Don - Shan River of Ro - Tung, the model reveais that the results of simulation are closed to those of observations and the simulated conditions show very reasonable. The model is expected for further modifications in order to apply for the simulation of similar inundated conditions in other regional drainage plannings of Taiwan.
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