Taking the two-grades tree-shaped river network of someplace in southern Jiangsu province as an example,based on the water quality simulation by using S-P water quality model,the water pollution controlling optimization model,in which the object function was to minimize the sum cost of sewage disposal and transferring water for dilution,was established in this paper.

This paper analyzed the spatial characteristics of tree-like river networks,and built vector model based on graph theory.

Taking tree-like river as an example,we used the theory of graph crossing point of main-secondary reach as node of graph channel as border of graph,and direction of river as direction of oriented graph,represented complex river network with oriented graph,and spatial relation of tree-like river with graph.

Water quality mathematical model for looping river network based on uncertain information;

Dynamic water quality model for looping river network based on the framework of uncertainty analysis:A case study of Wenruitang River Basin;

Application of unsteady water quality model for looping river network to water pollution control planning;

Characteristics of braided river sandstone reservoir in Zhuang 106 area;

Combined with practical geology conditions of Early Permian in Jingbei area of Ordos basin and systematic analysis results of deposi-tional characteristics,a new viewpoint is proposed that the depositional system of Early Permian in the area belongs to braided river-shallow water delta deposits,and the sedimentary facies model is built.