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| DOI： |
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| Managing Groundwater Resources in Spring Recharge Area of Jinan Using the Two-stage Optimization Allocation Model |
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FENG Baoping, WU Dong, ZHANG Zhanyu, LIANG Zhenhua, HUANG Jiwen
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State Key Laboratory of Efficient Irrigation and Agricultural Soil and Water Environment in South Area，Hohai University, Nanjing 210098, China; College of Water Conservancy and Hydropower Engineering，Hohai University， Nanjing 210098, China; Shandong Provincial Water Resources Research Institute， Jinan 250013, China
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| Abstract: |
| Unsustainable use of groundwater for irrigation has led to groundwater deterioration around the world. In Licheng District of Jinan, pumping groundwater for irrigation has resulted in groundwater table decline and affected natural flow of springs in the areas of Jinan and Baiquan. In this paper we analyzed sustainable allocation of groundwater for irrigation over the recharge areas of the springs in Jinan using two-stage optimization allocation model, considering the demands for groundwater from both agriculture and ecology. The model consists of two stages. The first one sets ecology, water saving and economic profits as the objective and calculates the response coefficient of groundwater, from which we calculated the optimaluse of surface and groundwater by constraining continuous drop of groundwater table. The second one is to maximize crop yields by readjusting the planting area of each crop and optimally allocate the amount of water calculated from Stage 1 to different growing stages of the crops. We found that implementing the results calculated from the model could reduce groundwater use. In particular, change the ratio of annual use of surface water to the use of groundwater from 3∶7 in 2011—2014 to 5.2∶4.8 could rebound the groundwater table by 0.31, 1.12, 1.55 and 3.38 m respectively from 2011 to 2014, sufficient to keep the springsin Jinan flow naturally |
| Key words: groundwater recharge; two-stage optimal allocation model; groundwater level; unit impulse response coefficient |
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