| 渭河平原地下水分布特征与环境同位素研究——以白杨水源地为例 |
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| 关键词:source region of water isotope age of groundwater Weihe plain |
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| A Study on the distribution and envirounment isotope of underground water in the weihe plain——envidence from baiyang source region of water |
| Weihe river,the largest tributary of Yellow river,is the main trunk river of river system in the central Shaanxi Plain. Weihe river plain is sitrated in the middle sector,Shaanxi province.It was resultiag from long evlution of Weihe river system.It is a Cenozoic graben basic with considerable thich Cenozoic deposits.The south and north borders are respecitvely bounded by Qinling Mountains and North Mountains ,Which extends about 300km in length from Baoji on the west to Tongguan on east,Shaanxi province where it meet Yellow river. Weith river has an asymmetric drainage. Its north bank tributaries present a dendritic drainage,whereas south tributaries a featherllke drainage. Baiyang source region of water is located at the flood plain-terrace I on the south bank of Weihe river,near the Linghe-Weihe rivers junction at Baiyang country in Weinan county,covering an area about 10km2.It is a soure region of water of polylaminate texture consisting of quaternary alluvions and lake deposits,containg a phreatic water,a shallow,a middle and a deep confined water four aquifers. Phreatic water is maily supplied by lateral influent seepage of river,and infiltration of precipitated water. Being exploited, it is mainy supplied by lateral in fluent seepage of river and runoff. Confined water is mainly supplied by underground water flow from west side of exploration region. As phreatic table is a little higher than shallow confined water,and middle confined water higner than deep confined water, there is an overwash relationship between them. Shallow confined water and phreatic water is some section of source region of water turn into saline water. It result from geolgical environment and gydrogeochemical environment characters of the storage and migration of underground water at the source region of water. Feeeding water from Weihe river makes up about 1/2 of feeding phreatic water at the Baiyang source region of water. Water-bearing strata have a better permeabiling,and water exchange is better too. The water production of a single well is more than 5000m3/d. Middle and deep confined water was buried at a deeper depth, with feeder channel being longer,and the age of underground water being more than 4000-8000 years. B.P. |
| LI Xing-guo,CHANG Pei-xing,GAO Wen-yi,HE Juan-hua,ZHANG Mao-hua,QI Jia-lin,XU Ren-chao,XU Qing-zhou.1994.A Study on the distribution and envirounment isotope of underground water in the weihe plain——envidence from baiyang source region of water[J].Acta Geoscientica Sinica,15(1,2):177-188. |
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