中文摘要：

在许多河流的上游或者在河流的枯水季节，地下水的补给作用对河流水质有着重要影响。用以忽略弥散的一维水质模型为基础的、考虑地下水补给影响的新的水质模型解析解，讨论其在地下水与河流之间无水量交换和河段起始段面上游没有来水两个特定条件下的数理意义和论证该解析解的正确性。通过对比新解析解和不考虑地下水补给的经典解，讨论点源与线源之间的内在联系和本质区别，论证新解析解不是经典解的简单迭加。利用新解析解，定量研究了地下水补给强度对河流污染物浓度沿河衰减过程的影响规律。以安徽省境内颍河为例，利用实测数据研究地下水补给对河流污染物浓度的影响程度；研究表明，在枯水季节，忽略地下水补给的作用，将导致水质模型计算误差的理论值达到9．3％。

英文摘要：

The groundwater discharge or in dry season. Based on the I-D may significantly affect the water stream water quality model with quality in upper reaches of rivers groundwater discharge taken into account and neglecting the dispersion effect, a new analytical solution for determining water quality is deduced. The physical significances of this solution under two special conditions including without water exchange between groundwater and river stream and without incoming water from upper stream of the river are discussed and the validity of this solution is d classical solution which neglecting groundwater di emonstrated. By comparing the solution with the scharge, the internal relationship and essential difference between point-source and line-source contamination are discussed, and it is demonstrated that this solution can not be obtained from the simple superposition of the classical solution. By using this proposed solution the influence of groundwater recharge intensity on decay process of contamination concentration in river flow can be quantitatively studied. The application to Yinghe River shows that the calculation error reaches 9.3 % if groundwater discharge is neglected in dry season.