论文部分内容阅读
近年来,有限元方法已广泛应用于地下水资源评价,且取得可喜成绩。但以往利用三角形单元计算时,都把井作为一点处理,而井附近的水头用其它结点水头线性(或高次)插值求得。利用这种插值方法有两个缺点:一是不能反映井径大小的作用,二是不能反映井附近降落曲线为对数流态的性质。因为在紧靠井壁处,流线几乎与井壁相切,当井壁作为第一类边界时,计算的水位偏低,反之,当井壁作为第二类边界时,计算
In recent years, the finite element method has been widely used in groundwater resources assessment, and achieved gratifying results. In the past, however, the calculation of the triangle unit took the well as a point, while the head near the well was calculated by linear (or high-order) interpolation of the other node head. There are two disadvantages to using this interpolation method: one is that it can not reflect the effect of well diameter, and the other is that it can not reflect the nature of the logarithm of the landing curve near the well. Because the flow line is close to the borehole wall in the immediate vicinity of the borehole wall, the calculated water level is low when the borehole wall serves as the first type of boundary. Conversely, when the borehole wall serves as the second type of boundary,