Journal of Geo-information Science >
Algorithm of Karst Fracture Seepage Path Construction Based on Disc Generalized Model
Received date: 2015-06-09
Request revised date: 2015-08-10
Online published: 2016-02-04
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The identification and reconstruction of karst fracture network has always been a hot and difficult topic in the research of karst groundwater resources and geological environment protection. Based on the original surface fracture data obtained in Zhangfang, Fangshan district in southwest Beijing and the surface fracture records processed through Kriging interpolation method, a construction method of the flow path based on disc model is proposed, focusing on the identification module of flow passage in three dimensional fracture structure and the underground fracture data obtained by Monte Carlo method. The flow path along the fracture generalized by disc model is simulated using directed graph data structure, and is stored through the form of adjacency matrix. In order to meet the demand of fast intersection operation in large scale fracture data and to improve the operation efficiency of karst fracture simulation system, this study gives a three dimension R-tree index algorithm to reduce the time of traversing each sampling point. Finally, based on the sampling surface fracture data of Zhangfang, Fangshan district in southwest Beijing, with the assistance of remote sensing geological survey, fine geological survey of key karst areas, and sampling analysis, this pager commits to the studies of the network distribution model for three dimension fracture space. The algorithm for building the path of karst fractures has also been simulated by computer. It provides a visualized analysis method for the study of karst development mechanism and the numerical simulation of karst water fracture in Zhangfang area.
Key words: karst area; fracture; disc model; seepage path
LI Xiangchen , RUI Xiaoping , QU Xiaokang , SONG Xianfeng , WANG Huifang . Algorithm of Karst Fracture Seepage Path Construction Based on Disc Generalized Model[J]. Journal of Geo-information Science, 2016 , 18(2) : 182 -189 . DOI: 10.3724/SP.J.1047.2016.00182
Fig. 1 Disc model图1 圆盘模型 |
Fig. 2 All of the parameters in the disc model (n is the normal vector)图2 圆盘模型参数(n为法向量) |
Fig. 3 Underground fracture network is generalized as a directed graph图3 地下裂隙网络概化为有向图 |
Fig. 4 The centers of the intersecting discs are acting as the path nodes图4 相交圆盘圆心作为通路结点 |
Fig. 5 Directed graph图5 有向图 |
Fig. 6 Axis-aligned bounding box图6 轴向包围盒法判断裂隙相交 |
Fig. 7 Block algorithm图7 分块算法判断裂隙相交 |
Fig.8 Optimization of spatial fracture based on R tree algorithm图8 基于R树算法的空间裂隙优化示意图 |
Fig. 9 Simulation map of the study area (with remote sensing base map)图9 研究区模拟图(遥感底图) |
Fig. 10 The panorama of the fracture图10 裂隙绘制全景图 |
Fig. 11 The local map of the fracture图11 裂隙绘制局部图 |
Fig. 12 The panorama of the dynamic flow path of groundwater in the fracture network图12 裂隙网络中地下水的动态渗流路径全景图 |
Fig. 13 The local map of the dynamic flow path of ground water in the fracture network图13 裂隙网络中地下水的动态渗流路径局部图 |
The authors have declared that no competing interests exist.
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