Evaluation of groundwater resources carrying capacity in North China Plain
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Abstract:
Groundwater is over-exploited in North China Plain, and this brings a series of eco-environmental problems. The sustainability of groundwater carrying capacity in NCP is faced with an unprecedented challenge. The definition of groundwater carrying capacity was put forward in this study and a new evaluation method for groundwater carrying capacity was proposed. The cities were grouped into three regions, i.e. the non-over-exploited and non-overloaded region (NN), the over-exploited but non-overloaded region (ON), and the over-exploited and overloaded region (OO). The results showed that the GDP supported by groundwater was 1560.8 billion RMB in 2003, and it quickly increased to 3758.5 billion RMB in 2011. 33.3% of the cities belong to the NN region. NCP as a whole and 57.2% of the cities belong to the ON region, where groundwater has been over-exploited, but the water use efficiency is relatively low, so there is still room for social and economic development if the water use efficiency is enhanced. 9.5% of the cities belong to the OO region. In the end, we discussed the approaches to enhancing the groundwater carrying capacity, including increasing the available groundwater quantity and enhancing the water use efficiency.
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