Study On Modeling Of Digital Integrated Water Resources Operation And Management System In A Catchment

The catchement digitalization play more important role in the processing of China water conservancy modernization. It is the key technology of implementing sustainable development and modern management in a catchment. Under the background of global informatization , it is an attractive idea to establish a digital integrated water resources operation and management system, which based on the digital earth technology system, and for the purpose of the improvement of water resource operation and management in a catchment.This paper firstly describes the development status, integrated structure, operational functionalities of digital system in a catchment and presents great feasible implement schemes of catchment informatization . In the second part, the water circulation process and its physical principles are analyzed in details . According to the water supply system structure and water resources operation principles of catchment, the method of large scale system decomposition-coordination is applied to solve the problems of optimized water allocation system , and the two-level hierarchical optimization model is established and resolved by simulation technique combined with the optimal control arithmetic. Many challenges are associated with the integration of GIS with models of specific applications in the digital system for a catchment. In order to adapt models to the environment of GIS, the third part of this paper present two means of integrating the model into GIS, one is using the COM technologies to develop the components of the model directly ,the other is taking out the model from the model bases, then utilizing the COM or DLL to develop the program modules relate to the integration process,and reducing the constrains and variables by use of intelligent assistant of knowledge bases.Data matching and unique management of digital integrated system require a special approach to develop the GIS based data organization and management model. Such a model must be robust enough to efficiently handle large amounts of data, and flexible to allow users to manipulate a wide variety of information. In the fourth part, a conceptual application-oriented data organization model in the GIS environment, is formulated to integrate the physical and logical components of the modeling problem into an operational framework, based on which, extended GIS functions are developed to implement a tight linkage between the GIS and the water resources management model. Then, the object-oriented representation method of Spatial objects and the relationship between them are presented, based on which, the object-relational figures are designed by use of Unique Modeling Language. And the approaches of translating object-relational figures into data tables are discussed in details. The concept and methodologies described in this paper is used for designing the integrated database for water resources operation and management system in a catchment .The main innovations summing up is acquired in the whole dissertation.Firstly, this paper proposes an all–round implement schemes and integrated structure of digital system in a catchment . The digital system have the operational functionalities of visualization, networking ,intelligent expression ,integration and the characteristics of economic,feasibility and so on .Secondly, the modeling method of this paper is different from the former work. The whole catchment area is divided into a lot of units according to the characteristics of water conservancy collocation and water and soil distribution. To overcome the limitations of the past work, the integrated optimal operation of multi-reservoirs and irrigation canals is used to allocate limited water to the department with most water demand. The weight coefficients are determined according to the urgent degree and economical benefits of water supply between different water demand departments. It is the effective approach to reasonable utilize limited water resources, and increase the benefits of water supply. The constrains are re...