| This article has been：Browse 1041Times Download 2917Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2021544 |
|
| Multi-layer and Multi-objective Coordinated Regulation of Agricultural Water Resources in Irrigation Districts with Water Supply Uncertainties Considered |
|
LI Mo, LIU Wuyuan, FU Qiang, LI Haiyan, ZHAO Li
|
|
Northeast Agricultural University, Harbin 155000, China
|
| Abstract: |
| 【Objective】Rational allocation of agricultural water resources in irrigation areas is essential to improving agricultural water use efficiency, but challenging due to its multi-level, multi-objective and multi-variable characteristics in its operations. The purpose of this paper is to propose a multi-layer and multi-objective coordinated regulation of water resources in irrigation districts with water supply uncertainties considered.【Method】Taking Jinxi Irrigation District in Heilongjiang Province as an example, this paper establishes a multi-objective and two-layer cooperative regulation system to optimize the agricultural water resources based on quantitative characterization of the interval uncertainty in water supply fluctuations. The model is to achieve a synergistic enhancement of farmers’ income and economic and social benefits by optimizing the use of surface and groundwater for different crops in the backbone channels of the irrigation district at different water distribution times. The two-layer model has coordinated mutual feedbacks between water supply and water use and is solved by the integration of optimal-disadvantage method, fuzzy mathematical planning, and large system decomposition-coordination method.【Result】The economic benefits of the irrigation district varies between 20.52 and 25.03 billion yuan, and the water allocation varies between 475.34 and 512.75 million m3. Compared with business as usual, the proposed method reduced groundwater utilization by 7%, alleviating the over-exploitation of groundwater. The proposed method also increased economic benefit per unit of water by 14.5%, effectively improving water utilization rate. The Gini coefficient of the water allocation is between 0.36 and 0.55, indicating a fair water allocation between different crops in different sub-districts. 【Conclusion】The model proposed in this paper for coordinating regulation of multiple water sources for different uses in irrigation districts can help sustainable development of irrigation districts, improve water allocation to cope with the impact of changing environments. |
| Key words: agricultural water resources; multi-layer and multi-objective optimization model; synergistic regulatory; uncertainty; Jinxi Irrigation District |
|
|
