| 华北平原地下水演化地史特征与时空差异性研究 |
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| 关键词:North China Plain groundwater evolution geohistory characteristic temporal-spatial diversity constraint behavior |
| 基金项目:国家科技支撑计划项目(2007BAD69B02)和国家重点基础性研究项目(2006CB403401) |
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| Geohistory Characteristics and Temporal-Spatial Diversity of Groundwater Evolution in North China Plain in Holocene |
| The evolution of regional shallow groundwater in North China Plain over the past 12000 years has gone through three stages, i.e., the increasing precipitation in early Holocene, abundant precipitation in middle Holocene and frequent drought in late Holocene on the scale of hundred or millennial years. In these stages, the rate of water fluxes among net recharge of the regional shallow groundwater and precipitation surface runoff and land evaporation varies with the precipitation. The variation of the rate obviously shows temporal-spatial diversity, which serves as a natural geographical condition. The recharge of groundwater is sufficient in the rainy period, and is less in the rainless period of the regional hydrologic circulatory course so that the groundwater level and the sea surface tend to decline. The latent capacity of utilizing groundwater is variable, which depends on the land proc-esses of the regional hydrologic circulation. The land processes are adjusted so that the utilization ratio rises. The system of the regional shallow groundwater is in the negative balance if the average precipitation in the studied period is less than 280~350 mm. The main recharge period of groundwater is sufficient from 8.0 to 3.5 kaB.P. The precipitation is the key factor, which causes the evolution of regional groundwater in North China Plain. The coef-ficients of the relationship between regional groundwater evolution, precipitation surface runoff and land evapora-tion change continuously with the evolution of the regional hydrologic circulation in periodicity. Therefore, the adhering to the principle of water circulation together with the optimal adjustment of surface water is beneficial to the sustainable utilization of groundwater resources. |
| ZHANG Guang-hui,LIU Zhong-pei,LIAN Ying-li,YAN Ming-jiang,WANG Jin-zhe.2009.Geohistory Characteristics and Temporal-Spatial Diversity of Groundwater Evolution in North China Plain in Holocene[J].Acta Geoscientica Sinica,30(6):848-854. |
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