圩区水文过程直接影响到长江中下游平原区的旱涝灾害、水资源优化配置以及湖泊水文水质状况。受自然因素和人类活动双重作用的控制，平原圩区表现出圩内水循环过程复杂，圩内外水流交换频繁等特点，成为水文模拟的难点。针对荷兰平原区WALRUS模型在南方圩区模拟中的不足，拟对其进行改进和扩展，包括改进农田蒸散模块和圩区出口排水模块，加强对频繁灌排水背景下水田蒸散过程的模拟和出口排水模式的准确识别；增加圩内地下水与圩外河道水流交换模块和作物产量预报功能。在试验区尖圩野外水文监测的基础上，利用改进后的模型对圩区水文多要素进行模拟与验证，分析在强降雨事件和不同季节下水文多要素的变化规律，并探讨圩区水文循环过程对农业水务管理措施的动态响应机制。该研究可望在圩区水文模型构建、参数、模拟技术等方面取得重要进展，为圩区水文预报和水资源优化管理提供技术支撑和科学参考。

Polder hydrological processes directly affect the drought and flood, the optimized water-allocation of Yangtze plain as well as the water quality in downstream lakes. Influenced by nature and human activities, it has complicated hydrology processes within the polder, frequent water exchange between the polder and its surrounding water bodies, which greatly increase the difficulty of modeling task. To better describe the hydrological processes of Chinese lowland polder, the WALRUS model will be improved including the improvement of farmland evapotranspiration and polder drainage modules, increase of internal- external polder water exchange module and crop yield forecasting module. Based on the observed hydro-climatic data from Jianwei polder, the improved WALRUS model is employed to simulate the multi-variables of polder hydrological processes, to analyze the main hydrological elements change during the heavy rainfall event and different seasons, and to explore the mechanism in the response of main hydrological processes to agricultural water management. This study is expected to make some important progresses in the polder hydrological model construction, model parameters, and simulation technique. It can provide technical support and scientific basis for polder hydrological forecasting and optimal water management.