| 引用本文: | 刘 永,缴锡云,程明瀚,等.基于DEM与Logistic函数的灌区渠系工作制度模拟：以周桥灌区为例[J].灌溉排水学报,2020,39(9):101-107. |
| LIU Yong,JIAO Xiyun,CHENG Minghan,et al.基于DEM与Logistic函数的灌区渠系工作制度模拟：以周桥灌区为例[J].灌溉排水学报,2020,39(9):101-107. |
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| 摘要: |
| 【目的】以周桥灌区为例，针对自流灌区灌溉面积因水源水位变化而得不到保障的问题展开渠系工作制度模拟分析，以优化灌区渠系工作制度，提高该灌区自流灌溉面积。【方法】利用数字高程模型和Logistic函数建立周桥灌区的自灌率模型，将分条轮灌、分段轮灌、分片轮灌以及现行轮灌4种渠系工作制度代入该模型，结合输水损失、渠系水利用系数等指标进行比选。【结果】率定后的周桥灌区数字高程模型与实测数据的相关系数R达到0.96，MBE为0.27 m，可用于模拟灌区自灌率与渠首闸后水位的变化关系；各地块自灌率模型决定系数R2均达到0.74以上，相关性较高，运用Logistic函数建立的自灌率模型可行；利用该模型模拟4种典型渠系工作制度，发现分片轮灌自灌率达到97.11%，渠系水利用系数达到0.78，且输水损失仅为现行轮灌的45.37%。【结论】分片轮灌为最优渠系工作制度，可将分片轮灌结合自灌率模型应用到周桥灌区灌溉管理系统中。 |
| 关键词: 数字高程模型；周桥灌区；自灌率；渠系工作制度 |
| DOI：10.13522/j.cnki.ggps.2019378 |
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| Optimizing Channel Network Schedules Using the DEM and Logistic Functions: A Case Study Based on the Zhouqiao Irrigation District |
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LIU Yong, JIAO Xiyun, CHENG Minghan, LI Jiang
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1.College of Agricultural Engineering, Hohai University, Nanjing 210098, China;2. Key Laboratory of Hydrology-water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;
3. Collaborative Innovation Center for Water Security and Water Science, Hohai University, Nanjing 210098, China
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| Abstract: |
| 【Background】The operation of many gravity-driven irrigation districts in China is affected by a multitude of factors and improving their management is essential to increasing water use efficiency of the irrigation districts. Existing work on channel network in irrigation districts focused on economic return and reducing seepage loss, while most of them have overlooked the role of the gravity-driven flow in the system. 【Objective】The purpose of this paper is to show how irrigation areas in gravity-driven irrigation districts can be improved by optimizing water scheduling in its channel network. We took the Zhouqiao Irrigation District as a demonstrating example of the proposed model.【Method】The logistic function based on the digital elevation model was used to establish a self-irrigation model for Zhouqiao Irrigation District. We compared three irrigation schedules: Strip-based rotational irrigation, segment-based rotational irrigation and area-based rotational irrigation, with the currently used rotational irrigation taken as the control. The simulation results were combined with seepage loss and conveyance efficiency to compare the performance of the four schedules.【Result】The correlation coefficient and MBE between the elevation calculated using the digital elevation model and the measured data were 0.96 and 0.27 m respectively, indicating that the model can be used to calculate the self-irrigation rate and the water level at the sluice gate. The determination coefficient of the self-irrigation rate calculated from the model for each block was above 0.74. We simulated the four types of channel networks, finding that the self-irrigation rate under area-based rotational irrigation could reach 97.11%, reduced the seepage loss by 54.63% and improved the water use efficiency of the channel network to 0.78 compared to the CK.【Conclusion】Area-based rotational irrigation was most optimal for gravity-driven channel networks and it can be combined with the self-irrigation rate model to improve irrigation water management in Zhouqiao Irrigation District and other irrigation districts with water flow in them driven by gravity. |
| Key words: digital elevation model; Zhouqiao irrigation district; self-irrigation flow rate; channel network |
