Study On Geomorphology Of Sancha River Catchment In Guizhou Province

The research area of this paper is the Sancha River Basin of Guizhou Province,which is one of the important water sources for the water conservancy project in central Guizhou.Due to the superposition of multi-phase tectonic activities,the extensive distribution of strata in different periods and the uplift of neotectonic movements,the area The geological conditions are complex,the aquifer group type,groundwater type and hydrogeological structure are complex and diverse.The water cycle and water-rock processes are different,and multiple water-bearing media develop,inheriting or transforming the geomorphology of different geological history periods in the region,and increasing water quality protection.Difficulty,restricting the development and utilization of water energy,and the phenomenon and cause of geomorphology have become difficult to solve the problem.Based on this,the geomorphology is studied in depth to analyze the geomorphological laws and causes.The research results are conducive to revealing a series of water resources problems such as the physical and chemical properties of water flow,and can provide basic data and scientific basis for water resources development,agriculture and reservoir construction in the Sancha River Basin.This paper takes the Sancha River Basin as the research object,and uses the 1:550,000 geological map and 15m×15mDEM as the data source to study the Sancha River Basin based on the classification and zoning of geomorphological types and a large amount of geological data and survey data.Landform space differentiation law.The main research results of the thesis work are as follows:(1)Based on DEM,the elevation,elevation coefficient,slope,undulation,surface cut and surface roughness are extracted.The optimum statistical area is 2.6km2 by linear fitting.The best statistical unit of cutting degree is used.This paper fluctuates the optimal statistical area,and analyzes the geomorphological features and laws of the Sancha River Basin by analyzing the characteristics of topographic factors.(2)Based on the analysis of topographic indicators,under the premise of grasping the overall situation of the region,it is aimed at exploring the spatial differentiation law of landforms and the causes of geomorphology.Using the analysis method of system clustering,select the statistical parameters of the terrain elevation,slope,area ratio,curvature,and the statistical parameters of the mean six statistical parameters.Pearson correlation analysis is used to select the topographic factor statistical parameters with the correlation coefficient greater than 0.7(elevation standard deviation,The standard deviation of curvature,the average value of the slope,and the average of the area ratio.As the parameters of this analysis,the geomorphological type is divided at the neighborhood level instead of the pixel layer,and the formation lithology and field survey data are adjusted.The landforms are divided into karst landforms(remaining hills,hills,valleys,peaks and valleys)and non-karst landforms(shallow-cut mountains,medium-cut mountains,deep-cut mountains),and seven types of landforms are summarized.Characteristics.(3)Based on the topographic index and topographic classification results,according to the principle of landform zoning,the topographical zoning is carried out by means of superposition analysis,and the research is divided into four zones(I zone,II zone,III zone,IV zone),and the analysis is different.The topographical features and geomorphological combinations of the area are summarized,and the genesis of the Sancha River Basin is summarized and analyzed.