Three-dimensional (3D) dynamic water infiltration hierarchi-cally on multilayer of soil according to voronoi sequence nodes based on three-dimensional triangular irregular network (3D TIN)

Abstract

Understanding soil water infiltration movement has acquired ex-tensive interest and concern in the last few decades. The arrangement of particles (i.e. structures and size) and the interaction between soil and soil water have a profound effect on the soil water infiltration. The challenging task in soil fluid modelling is the indeterminate spatial extent that have no specific boundaries and difficult to sense. Plenty investigations and studies have been conducted to measure the water movement. However, less focus were given on the movement of dynamic soil water infiltration. This paper will focus on modelling the three-dimensional (3D) soil water infiltrations that flow downward due to gravitational factor and gradient pressure. The 3D hierarchical soil water infiltration model proposed the integration of techniques which include Tree-map to isolate the depth of the soil that act as a route of soil water flow from the surface of the terrain to subsurface flow. Moreover, 3D Gosper curve was used to represent the soil water flow pattern that based on the law of gravity and Horton equation control the flow of soil water in the model. The curves that consist of series of nodes adopt Three-Dimensional Triangular Irregular Network (3D TIN) which creates a network of flow direction that allows the water pass through the nodes according to a predetermined sequence. The study area has average of 8.5 mm total rain and -5 meter water level. The soil is di-vided into a few layers to represent the flow of soil water according to se-quence of nodes. The soil depth (40 cm, 80 cm, 120 cm, 160 cm and 200 cm) isolation in form of Voronoi shaped polygon nodes allowing the soil water flowing down where the depth is chosen based on the soil wetting range of subsurface soil.