河流附近非水平初始面潜水渗流分析

考虑初始面非水平条件，建立河流边界控制下的半无限含水层渗流模型，提出非水平初始面及其相关参数（a、t_N）的简易计算方法，并探讨模型的适用条件。分析表明,该法适用于观测数据较少、地下水水位变幅相对于潜水含水层厚度较小、且观测孔距河岸较近条件下河流附近潜水含水层渗流计算。结合实例，采用查表法和配线法求解模型。计算结果表明:参数a和t_N的计算值不同，水位计算误差在0.02 m以内，较原公式精度有明显提高。新模型为初始面非水平条件下的潜水渗流计算提供一种简易方法。

Analysis of Phreatic Water Seepage Nearby River with Non Horizontal Initial Surface

Considering the condition of non horizontal initial surfaces, a transient flow model for semi-infinite aquifer seepage subjected to river boundary is constructed. The simple calculation methods of initial non-horizontal surfaces and their associated parameters (a, t_N) are proposed. The applicable conditions of the model are also explored. The result shows that the method is suitable for the seepage calculation when there are insufficient observation groundwater level data near the river, especially in the case that groundwater level variation is smaller campared to the thickness of unconfined aquifer and that the observation well is close to the river. Case analysis show that the calculated values of parameters a and t_N are different using the lookup table method and wiring method. Calculation error of the water level is within 0.02 m. The free surface calculation results are much better than the existed formulas. An easy method for calculating water seepage of the initial conditions of non horizontal surfaces is provided.