Abstract: Based on the current research status of weather forecasting and hydrological application，and grid computing technology，a scalable Grid model is proposed for the Weather and Hydrological applications（WHaGrid）.In this paper，a scalable grid model is proposed for WHaGrid.Its framework and corresponding components’ design are paid more attention.Firstly，heterogeneous weather and hydrology resources across diverse organizations are integrated for uniform accesses.Common elements in various weather forecasting and hydrological applications are extracted and shaped to the authentication and activity control of users，atop of which different application services running independently can be loaded into the system dynamically to accept submitted jobs.Analysis shows the proposed model is of great flexibility and scalability.

Key words: weather and hydrology, grid computing, application framework

摘要： 基于气象水文和网格技术的发展现状，结合气象水文领域的应用特点，提出了一种可扩展的气象水文网格模型，重点研究网格技术在气象水文领域的应用框架及其模块结构。该网格模型首先通过网格技术将异构的气象水文资源进行整合和统一管理；抽取各气象水文应用的公共元素，提供统一的用户认证和用户活动控制；并在此基础上通过动态承载气象水文应用服务的办法来保证各类应用的独立运行，同时各种新的气象水文应用可以加载到已有的网格环境。分析表明该气象水文网格模型具有很强的灵活性和可扩展性。

关键词: 气象水文, 网格计算, 应用框架