Optimizing groundwater recharge plan in North China Plain to repair shallow groundwater depression zone, China
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Abstract: The North China Plain is one of the main grain producing areas in China. However, over-exploitation has long been unsustainable since the water supply is mainly from groundwater. Since 2014, the South-to-North Water Diversion Project’s central route has been charted to the integrated management of water supply and over-exploitation, which has alleviated the problem to a certain extent. Although the Ministry of Water Resources has made many efforts on groundwater recharge since 2018 most of which have been successful, the recharge has not yet been sufficiently focused on the repair of shallow groundwater depression zones. It still needs further optimization. This paper discusses this particular issue, proposes optimized recharge plan and provides the following recommendations: (1) Seven priority target areas are selected for groundwater recharge in alluvial and proluvial fans in the piedmont plain, and the storage capacity is estimated to be 181.00×108 m3; (2) A recharge of 31.18×108 m3/a is required by 2035 to achieve the repair target; (3) It is proposed to increase the recharge of Hutuo River, Dasha River and Tanghe River to 19.00×108 m3/a and to rehabilitate Gaoliqing-Ningbailong Depression Zone; increase the recharge of Fuyang River, Zhanghe River and Anyang River to 7.05×108 m3/a and rehabilitate Handan Feixiang-Guangping Depression Zone; increase the recharge of Luanhe River by 0.56×108 m3/a and restore Tanghai Depression Zone and Luanan-Leting Depression Zone; moderately reduce the amount of water recharged to North Canal and Yongding River to prevent excessive rebound of groundwater; (4) Recharge through well is implemented on a pilot basis in areas of severe urban ground subsidence and coastal saltwater intrusion; (5) An early warning mechanism for groundwater quality risks in recharge areas is established to ensure the safety. The numerical groundwater flow model also proves reasonable groundwater level restoration in the depression zones by 2035.
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Figure 2. Hydrogeological profile of the North China Plain (Zhang et al. 2009)
Table 1. Situation of shallow groundwater depression zones in the North China Plain in 2020
Depression zones Size/104 km2 Depth of the zone centre/m Gaoliqing-Ningbailong depression zone 9 636.60 103.19 Xiongxian-Bazhou depression zone 1 989.14 62.82 Handan Feixiang-Guangping depression zone 2 035.54 79.75 Pingxiang-Quzhou depression zone 356.82 53.52 Langfang Sanhe depression zone 873.63 38.51 Tanghai depression zone 823.12 30.49 Luannan-Leting depression zone 149.28 14.21 Table 2. Deficit in shallow groundwater depression zones
Depression zones Groundwater level in 2020/m Restoration targets/m Deficit/108 m3 Gaoliqing-Ningbailong depression zone −55–−10 5–30 227.99 Xiongxian-Bazhou depression zone −30–−5 1–10 19.52 Handan Feixiang-Guangping depression zone −30–20 42–60 46.55 Pingxiang-Quzhou depression zone −15–0 25–30 9.45 Langfang Sanhe depression zone −10–0 4–25 7.84 Tanghai depression zone −10–−25 0–4 4.93 Luannan-Leting depression zone −10–−5 0–2 0.97 Total 317.25 Table 3. Regulation space for recharge priority target areas in the North China Plain
Recharge priority target areas Size/km2 Buried depth/m Regulation space/108 m3 Luanhe River Alluvial-proluvial fan 2 728.78 6–30 8.30 Chaobai-Jiyun River Alluvial-proluvial fan 2 107.90 8–35 13.90 Yongding River Alluvial-proluvial fan 2 543.99 15–30 16.30 Juma River Alluvial-proluvial fan 927.36 12–28 7.90 Hutuo-Dasha River Alluvial-proluvial fan 6 456.71 18–57 118.90 Fuyang River Alluvial-proluvial fan 923.51 8–41 4.80 Zhanghe River Alluvial-proluvial fan 1 025.06 12–48 10.90 Total 16 713.31 181.00 Table 4. Optimized Plan for Groundwater Recharge in the North China Plain
Recharge
target areasDepression zone repair Recharge source Recharge river Deficit
/108 m3Recharge infiltration rate Repair water requirements
/108 m3Optimized plan
/108 m3/aTo be optimised plan—
recharge volume in 2020
/108 m3/aLuanhe River alluvial-proluvial fan Tanghai depression Zone, Luannan-Leting depression zone Luanhe River Source, Panjikou Reservoir, Daheiting Reservoir, Taolinkou Reservoir Luanhe River 5.90 0.70 7.38 0.56 / Chaobai-Jiyun River alluvial-proluvial fan Langfang Sanhe depression zone Source of South-to-North Water Diversion Project’s Central Route, Miyun Reservoir, Huairou Reservoir Chaobai River, North Canal 7.84 0.85 9.22 0.61 7.56 Yongding River alluvial-proluvial fan Xiongxian-Bazhou depression zone Source of South-to-North Water Diversion Project’s Central Route, Guanting Reservoir Yongding River, North Juma River-Baigou River 19.52 0.495 26.56 1.77 3.46 Juma River alluvial-proluvial fan Source of South-to-North Water Diversion Project’s Central Route, Angezhuang Reservoir South Juma River 0.57 11.18 0.75 0.88 Hutuo-Dasha River alluvial-proluvial fan Gaoliqing-Ningbailong depression zone Source of South-to-North Water Diversion Project’s Central Route, Huangbizhuang Reservoir, Wangkuai Reservoir, Xidayang Reservoir Hutuo River, Dasha River, Tanghe River 227.99 0.80 284.99 19.00 11.43 Fuyang River alluvial-proluvial fan Pingxiang-Quzhou depression zone Source of South-to-North Water Diversion Project’s Central Route, Zhuzhuang Reservoir Qili River-Shunshui River 9.45 0.44 21.48 1.43 2.06 Zhanghe River alluvial-proluvial fan Handan Feixiang-Guangping depression zone Source of South-to-North Water Diversion Project’s Central Route, Yuecheng Reservoir, Dongwushi Reservoir Fuyang River,Zhanghe River, Anyang River 46.55 0.44 105.80 7.05 3.19 Total 317.25 317.25 466.60 31.18 -
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