| 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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| 引用本文：黎兴国,常丕兴,高文义,何娟华,张茂生,齐加林,许仁朝,徐庆周.1994.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[J].地球学报,15(1,2):177-188. |
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| 中文摘要:白杨水源地座落在渭河下游重镇——渭南市西北约5km处，为渭河冲积平原的一部分。区内第四纪松散堆积物巨厚，地形平坦，降水充沛，地表水丰富，为地下水储存提供了良好的空间。按含水介质的埋藏条件可划分为潜水、浅层承压水、中层承压水和深层承压水4个含水岩组。为了进一步研究地下水的补给形成机制、储存运移过程、排泄开采条件，本文结合环境同位素（包括14C、13C、3H、D和18O）对水源地地下水年龄、地下水运动速率以及一些水文地质参数进行研究和探讨。而同位素测定表明：水源地潜水为现代水，3H含量较高，河水补给量占1/2 |
| 中文关键词:水源地 同位素 地下水年龄 渭河平原 |
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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 |
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| Abstract: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. |
| keywords:source region of water isotope age of groundwater Weihe plain |
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