Catchment area critical rainfall calculating method based on DEM

A calculation method and catchment area technology, applied in the fields of geographic information and surveying and mapping, can solve problems such as calculation result errors, difficulty in collecting complete disaster sample points, failure to meet urban waterlogging monitoring and early warning needs, and achieve scientific and reasonable calculation results

Inactive Publication Date: 2016-07-13
NANJING UNIV OF INFORMATION SCI & TECH
View PDF2 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The critical surface rainfall in the catchment area is of great significance for the prediction of waterlogging in the catchment area. The traditional calculation of the critical surface rainfall in the catchment area often uses statistical analysis methods, that is, the regression analysis equation between the water accumulation depth and rainfall is established through several sample points. The critical surface rai

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] Let's take a catchment area as an example to calculate the rainfall when the accumulated water depth is 0.1m. The original DEM data of the catchment area are shown in Table 1. The side length of the DEM grid is 30m, and the area of ​​each grid is 900m 2 , the total area of ​​the catchment area is 57600m 2 . The runoff coefficient of this catchment area is α=0.87.

[0021] A DEM-based calculation method for critical rainfall in catchment areas, comprising the following steps:

[0022] Step 1: Traverse the DEM grid of the catchment area (Table 1) to find the elevation value h of the lowest point of waterlogging min =4.12m;

[0023] 4.13 4.14 4.12 4.23 4.25 4.26 4.22 4.32 4.16 4.15 4.13 4.25 4.26 4.21 4.23 4.25 4.15 4.22 4.17 4.19 4.25 4.26 4.18 4.19 4.15 4.18 4.12 4.23 4.25 4.21 4.22 4.32 4.19 4.15 4.13 4.22 4.26 4.21 4.36 4.25 4.35 4.29 4.36 4.44 5.24 5.12 5.13 5.25 5.12 5.32 5.36 5.15 4.6...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a catchment area critical rainfall calculating method based on a DEM. The method comprises the steps that a waterlogging minimum point hmin of a catchment area is firstly acquired, an elevation value of the waterlogging minimum point is added to a maximum value delta h of the waterlogging depth to obtain a waterlogging elevation value of the catchment area, a height difference delta h obtained by subtracting the waterlogging elevation value from an original DEM diagram layer serves as a waterlogging depth value of each grid, the grid waterlogging depth delta h is added to the average drainage capability d of the catchment area to obtain the runoff volume q of the grid, and the runoff volume q of all the grids is accumulated to obtain the total sum of the runoff volume of the catchment area; the ratio of the total runoff volume to a runoff coefficient alpha serves as the total rainfall of the catchment area; the total rainfall is divided by the area of the whole catchment area to obtain the unit area rainfall, that is, the catchment area critical rainfall generated when the waterlogging depth is delta h. According to the method, personal errors generated when the waterlogging depth is manually collected for regression analysis in the past are omitted, so that a calculating result is more scientific and reasonable.

Description

technical field [0001] The invention discloses a DEM-based method for calculating the critical surface rainfall of accumulated water in a catchment area, which belongs to the technology of surveying and mapping and geographic information. Background technique [0002] In urban waterlogging risk assessment, it is necessary to evaluate the critical surface rainfall of the water accumulation depth in a catchment area, that is, how many millimeters of rain falls in this area when the water accumulation reaches a certain depth in a certain watershed area. [0003] The critical surface rainfall in the catchment area is of great significance for the prediction of waterlogging in the catchment area. The traditional calculation of the critical surface rainfall in the catchment area often uses statistical analysis methods, that is, the regression analysis equation between the water accumulation depth and rainfall is established through several sample points. The critical surface rainf...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 薛丰昌宋肖依黄敏敏
Owner NANJING UNIV OF INFORMATION SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap