| Cite this article: | 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,(9):-. |
| LIUYONG,JIAOXIYUN,CHENGMINGHAN,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,(9):-. |
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| DOI： |
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| Simulation of channel work system based on DEM and Logistic function ——Case of Zhouqiao Irrigation District |
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LIUYONG, JIAOXIYUN, CHENGMINGHAN, LIJIANG
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College of Agricultural Engineering, Hohai University
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| Abstract: |
| There are many limiting factors irrigation water distribution in the plain gravity irrigation district in China. The water utilization coefficient of the channel system in the irrigation district is not high due to the imperfection of the project supporting and the improper operation of the channel system. The research on the simulation of channel work system mainly aimed at the irrigation economic profit and the canal seepage loss, while the study did not take the gravity irrigation area into account. For plain irrigation district, gravity irrigation area is also an important index to measure the working system of canal system in irrigation area.【Objective】This paper took Zhouqiao Irrigation District as an example to carry out the simulation analysis of channel work system to solve the problem that irrigation area of gravity irrigation district cannot be guaranteed due to the change of water level.【Method】Based on the Digital Elevation Model, Logistic function was used to establish the self-irrigation rate model of Zhouqiao Irrigation District. Rotational irrigation in proper order, rotational irrigation in segment, rotational irrigation in area and current rotational irrigation were brought into the model for comparison. The simulation results are combined with the canal seepage loss and conveyance efficiency of canal system to compare the previous four channel work system.【Result】The correlation coefficient between the selected Digital Elevation Model of Zhouqiao Irrigation District and the measured data is 0.96, MBE is 0.27 m，which can be used to simulate the relationship between self-irrigation rate and water level behind the sluice gate. The determination coefficient of the self-irrigation rate model of each block is above 0.74, which is highly correlated. The model is used to simulate four typical channel work systems, and it finds that self-irrigation rate of the rotational irrigation in area reaches 97.11%, the canal seepage losses is only 45.37% of current rotational irrigation and the canal-system water use efficiency reaches 0.78.【Conclusion】Rotational irrigation in area is the optimal channel work system. It can combine with self-irrigation rate model to provide guidance for the improvement of Zhouqiao Irrigation District irrigation management level. |
| Key words: Digital Elevation Model; Zhouqiao Irrigation Area; self-irrigation rate; channel work system |
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