回归水模拟的系统动力学模型

The System Dynamic Model of the Return Flow

以水量平衡原理为基础,运用系统动力学方法,并以Vensim软件包为工具,建立了稻田田间尺度水平衡转化过程的模拟模型,同时将此模型应用于稻田回归水量的模拟分析。通过对漳河灌区稻田田间尺度水量平衡转化过程的检验表明,模拟的地表出流过程与实测值吻合;模拟的田面水位的涨落趋势也与实测过程一致,田间水位动态模拟峰值最大误差为10%;模型能反映稻田水量平衡转化过程。对田间尺度回归水量的动态模拟表明:地表回归水与来水量的变化趋势一致,地下回归水变化比较平稳,逐日回归水量动态变化随着来水量的增加表现出增加的趋势,同样累积回归水量随累积来水量的增加而增加。

Based on the System Dynamic approach and water balance method, this paper used Vensim software package to build water balance model of the field scale in the paddy field and applied the model to simulate the return flow of the paddy field. A case study in Zhanghe irrigation scheme shown the simulated variation trend of the field water depth and the surface flow are accorded with the observed; the maximum simulated error of the water depth is around 10 percent of observed; the model can reflect the transform processing of water balance in the field scale. The dynamic simulated results of the field scale indicated surface return flow changed with inflow but subsurface return flow changed little; the daily return flow increased with the increasing of inflow and the cumulated return flow also increased with the cumulated inflow.