渠首水位实时调控模型——以船行灌区一支渠为例

Real-time controlling model of canal head level:To Chuanhang irrigation district branch one as an example

很多大中型灌区在输配水过程中存在水位衔接不当的问题,加之田面高程存在起伏,使得灌溉时往往存在部分田面不能上水或受淹等问题。本文提出了空间灌溉率的概念,并利用GIS的三维分析功能研究了其与渠道渠首水位之间的关系。分析表明,空间灌溉率与渠首水位之间的关系符合Logistic曲线;针对船行灌区一支渠,得到该Logistic曲线的参数,并确定了一支渠渠首和干渠渠首不同空间灌溉率所需的水位,为灌区水位实时调控提供基础数据。

During the process of water transmission and distribution,many medium and large irrigation districts have the problem of improper water level convergence,and field surface elevation exists ups and downs,so part of the field surface can＇t be moisturized or submerged during irrigation. So the concept of the space irrigation rate was put forward in this study,and the relation between space irrigation rates and channel canal water level was studied by using three-dimensional analysis capabilities of GIS. Analysis showed that the relationship between the space irrigation rates and canal water level was consistent with the Logistic curve. Logistic curve parameters of Chuanhang Irrigation District Branch One were obtained,and water level of Branch One headwork and water level of canal headwork,which was required for different space irrigation rates,were confirmed. So the underlying data of regulation of water level in irrigation district with were provided.