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| DOI：10.13522/j.cnki.ggps.2020646 |
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| Spatiotemporal Variation of Shallow Groundwater in Puyang of Henan Province and Its Underlying Determinants |
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CAI Yi, XU Jia, ZHU Qing, RAO Yuangen, CAO Yongtao
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1. Department of Hydraulic Engineering, School of Civil Engineering, Tongji University, Shanghai 200092, China;
2. School of Continuing Education, Tongji University, Shanghai 200092, China; 3. Puyang Hydrology and Water Resources
Survey Bureau, Puyang 457000, China; 4. Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China
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| Abstract: |
| 【Background】Puyang in Henan province stretches across the Yellow River Basin and the Haihe River Basin.?This geographical location makes its agriculture depend upon Yellow River Water in the south and groundwater in the north. Long-term over-extraction of groundwater has substantially dropped the groundwater table to a depth critical to compromising food production and hindering economic development of the region.【Objective】The purpose of this paper is to analyse the spatiotemporal change in shallow groundwater table and its underlying determinants in attempts to provide guidance to help develop sustainable agriculture and water usage in the region.【Method】GIS coupled with sliding window correlation analysis was used to analyse the spatiotemporal variation of shallow groundwater table in Puyang, and the response of groundwater table to precipitation, water level in the Yellow River and agricultural irrigation usage was calculated, from which we discussed the strategies to secure water supply while in the meantime alleviating groundwater table to continuing to decline.【Result】Inter-annual groundwater table from 2006 to 2018 changed erratically in the north which is part of the Haihe River Basin, and declines gradually in the south which is part of the Yellow River Basin. In the north the groundwater was the shallowest in February, whereas in the south that was in April and October. The groundwater table in the north and south both dropped to the deepest point in June. Spatially, the depth of groundwater table increased from the south to the north, and along the Yellow River, it increased from upstream to downstream. The groundwater table in the north was closely correlated to precipitation but with a six-month delay, while the south it depended on the water level in the Yellow river with a one-month lag. Considering the continued decline in depth of groundwater table and the increased demand for water, we proposed to build hydraulic networks to connect ponds, channels and rivers in the regions to improve regulation and storage of both rainfalls and the water diverted from the Yellow River. Meanwhile, it also needs to improve implementation of water-saving irrigation technologies and increase reclaimed water reuse.【Conclusion】There are marked cross-basin differences in spatiotemporal variation of the shallow groundwater table in the studied region, with groundwater table in the north affected by precipitation and irrigation while in the south being mediated by the Yellow River. |
| Key words: Yellow River; shallow groundwater; spatiotemporal variation; irrigation; Puyang |
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