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河南平原第四系地下水氢氧同位素分布特征,总体上由北向南呈渐高趋势,浅、深层地下水系统水的δ18O值变化规律基本一致。平原北部系统水的δ18O值最低,并随着距离黄河越来越近而变得愈来愈小,呈现出“∨”型变化的特征。平原南部系统水的δ18O值最高,并随着距离淮河越来越近而变得愈来愈大,呈现出“∧”的变化特征。平原中部系统水的δ18O值介于该二者之间,且变化较平缓。浅层系统水主要为大气降水补给。深层系统水受开采作用,使得浅层水的越流补给已成为主要的补给来源。此外,平原北部浅层系统水,黄河侧渗补给亦是沿岸地下水的重要补给来源;而平原南部浅层系统水在接受降水补给的同时,还受到淮河的排泄。
The distribution characteristics of hydrogen and oxygen isotopes of groundwater in Quaternary of Henan Plain generally showed a trend of increasing from north to south. The δ18O values of groundwater in shallow and deep groundwater systems were basically the same. The δ18O value of water in the northern part of the plain is the lowest, and becomes smaller and smaller as the distance from the Yellow River becomes closer and shows the characteristic of “∨”. The δ18O value of water in the southern part of the plain is the highest, and becomes larger and larger as it gets closer to the Huaihe River, showing a “∧” variation. The δ18O value of water in the middle part of the plain is between the two, and the change is relatively gentle. Shallow system water is mainly supplied by atmospheric precipitation. Deep system water is exploited, making the over-flow recharge of shallow water a major source of recharge. In addition, shallow system water in the northern part of the plain and lateral supply of the Yellow River are also important sources of recharge of groundwater in the coastal areas. However, the shallow system water in the southern part of the plain is excreted by the Huaihe River while receiving precipitation recharge.