Development of an Object-Oriented Hydraulic Simulation Model for CanalNetworks Using a Relational Database

摘要

Canal models can be used to understand the hydraulic behaviour of complexrnirrigation networks. Numerical methods such as the finite difference (FDM), finiternelement (FEM) and finite volume methods (FVM) have become well-establishedrntools in water and hydraulic engineering. While finite difference schemes are widelyrnused in hydraulic engineering, they are not suitable for certain types of problems,rnparticularly flows which exhibit strong discontinuities. These limitations can be dealtrnwith by introducing shock-capturing techniques. FVM with shock capturing schemesrnapplied to the shallow water equations is thus suitable for modelling a variety ofrnflows, particularly the propagation of shocks and water level disturbances throughoutrnan irrigation network.rnThis paper describes an object-oriented implementation of the finite-volume-basedrnnumerical algorithm for the solution of the 1-D shallow water equations. The modelrnsolves the hydrostatic St. Venant equations using an explicit FVM with a Godunov-typernhigh-resolution shock capturing technique. The Riemann problem for the 1-Drnshallow water equations is solved using an exact Riemann solver capable of handlingrndry bed conditions. The model is developed for irrigation canal networks with anrnobject-oriented approach using Java and MySQL as a back-end for effective storagernand retrieval of the data. The model has been tested for mass conservation and ramprndischarge tests. Further development and testing are in progress.