Land-based watershed water use estimation method

Abstract

The application relates to a land-based method for estimating the water consumption of a basin. The land-based method for estimating the water consumption of a basin uses the type water consumption data of each administrative region in a water consumption statistical investigation direct reporting management system constructed in recent years by the Ministry of Water Resources, adopts layer data based on land types, calculates the land type area of each administrative region and the land type area in the basin range, obtains a conversion ratio, and estimates the water consumption of each type in the basin. Through ArcGIS software, the existing water consumption of each county-level administrative region is converted to the corresponding basin by using a digital processing method, the rapid processing and acquisition of the water consumption of a large-area basin can be realized, and the work efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the electronic information technology, and particularly relates to a method for estimating water consumption in a region. BACKGROUND

[0002] Water resources are important production and living resources. In order to serve the establishment of water resources rigid constraint system, solve the main contradiction of water resources in key river basins, and improve the efficiency of regional water resources utilization, in China, a water allocation scheme for river basins is formulated, and the upper limit of water allocation for each region is defined. The current water consumption of each administrative region in the relevant river basin needs to be calculated and evaluated every year.

[0003] The existing water consumption estimation of a river basin is obtained by multiplying the basic data such as cultivated land, population, industrial added value, etc. in each administrative region in the river basin by the corresponding water consumption quota and unit area water consumption quota. The data collection involves multiple departments such as water bureau, natural resources bureau, statistics bureau, agricultural bureau, housing bureau, industrial and information development bureau, and a large river basin involving multiple administrative regions has the problems of great difficulty in data collection and coordination, long collection process, and high cost. Moreover, due to the large amount and variety of data, the data processing is time-consuming and inefficient. SUMMARY

[0004] The present application proposes a new method for estimating water consumption in a river basin, which solves the problem of low efficiency of existing water consumption estimation.

[0005] The method for estimating water consumption in a river basin based on land type comprises the following steps:

[0006] Step 1: Obtain administrative region water consumption data: collect or prepare the amount of agricultural water, industrial water, domestic water, and artificial ecological environment water replenishment in the administrative region;

[0007] Step 2: Obtain land type data: extract two land types related to water consumption, i.e. cultivated land and artificial land surface, from the obtained vector layer through ArcGIS software, form a new land type layer of the administrative region, including a cultivated land layer and an artificial land surface layer;

[0008] Step 3: Extract the vector surface layer of the river basin range: through the ArcHydro Tools module in the ArcGIS software, use DEM to extract the vector surface layer of the river basin range through terrain processing and hydrological analysis;

[0009] Step 4: Obtain the area of land types in the river basin range: superimpose the vector surface layer of the river basin range and the administrative region surface layer to determine the administrative regions involved in the river basin;

[0010] Superimpose the administrative area face layer determined on the cultivated land layer of the administrative area to obtain the cultivated land layer within the range of each administrative area, and count the total cultivated land area within each administrative area; superimpose the basin range vector face layer on the cultivated land layer of each administrative area to obtain the cultivated land layer of each administrative area within the basin range, and count the cultivated land area within each administrative area involved in the basin;

[0011] Similarly, superimpose the administrative area face layer determined on the artificial surface layer of the administrative area to obtain the artificial surface layer within the range of each administrative area, and count the total artificial surface area within each administrative area; superimpose the basin range vector face layer on the artificial surface layer of each administrative area to obtain the artificial surface layer of each administrative area within the basin range, and count the artificial surface area within each administrative area involved in the basin;

[0012] Step 5, area proportion coefficient acquisition: divide the cultivated land area within the administrative area involved in the basin by the total cultivated land area within the administrative area to obtain the cultivated land area proportion coefficient of each administrative area; divide the artificial surface area within the administrative area involved in the basin by the total artificial surface area within the administrative area to obtain the artificial surface area proportion coefficient of each administrative area;

[0013] Step 6, calculation of total water consumption of the basin: multiply the agricultural water consumption of each administrative area obtained in step 1 by the cultivated land area proportion coefficient to obtain the proposed agricultural water consumption of the administrative area allocated within the basin range; multiply the industrial water consumption, domestic water consumption and artificial ecological environment water supplement of the administrative area obtained in step 1 by the artificial surface area proportion coefficient respectively to obtain the proposed industrial water consumption, domestic water consumption and artificial ecological environment water supplement of the administrative area allocated within the basin range; then add the proposed agricultural water consumption, industrial water consumption, domestic water consumption and artificial ecological environment water supplement within the basin to obtain the total water consumption of the basin.

[0014] In the present application, the agricultural water consumption, industrial water consumption, domestic water consumption and artificial ecological environment water supplement within the administrative area adopt the data in the water consumption statistical investigation direct reporting management system of the Ministry of Water Resources, or adopt the water consumption data obtained by actual investigation and statistics within the administrative area. The industrial water consumption of the present application is based on the artificial surface area proportion conversion, and can also be converted according to the number of town centers in the county-level administrative area involved in the basin accounting for the total number of town centers.

[0015] The application extracts the cultivated land and artificial land layer which is strongly related to water consumption by using the global 30-meter surface coverage data of the National Basic Geographic Information Center, analyzes the area proportion coefficient of cultivated land and artificial land in the administrative area in the basin, multiplies the proportion coefficient by the water consumption data of each administrative area in the Water Resources Department Water Consumption Statistical Investigation Direct Reporting Management System, and obtains the water consumption results of the basin. Through the ArcGIS software, the existing water consumption of each county-level administrative area is converted to the corresponding basin by using digital processing means, so that the rapid processing and acquisition of large-area basin water consumption results can be realized, and the work efficiency is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a water consumption statistical investigation direct reporting management system map of the Water Resources Department.

[0017] Figure 2 The figure is an industry water consumption map of the county-level administrative area in 2021.

[0018] Figure 3 The figure is a vectorized land class layer map using ArcGIS software.

[0019] Figure 4 The figure is a cultivated land and artificial surface layer acquisition map.

[0020] Figure 5 The figure is a face layer map of the county-level administrative area.

[0021] Figure 6 The figure is obtained by superimposing the cultivated land layer and the artificial surface layer on the face layer of the county-level administrative area.

[0022] Figure 7 The figure is an extraction map of the outlet point of Yanggongjiang in the DrainageLine layer.

[0023] Figure 8 The figure is a vector layer map of the Yanggongjiang basin range.

[0024] Figure 9 The figure is an analysis map of the county-level administrative area involved in the Yanggongjiang basin.

[0025] Figure 10 The figure is a cultivated land layer map of each county.

[0026] Figure 11 The figure is a superimposed cultivated land layer map of each county in the basin range.

[0027] Figure 12 The figure is a layer map of the cultivated land contained by each county in the basin range. DETAILED DESCRIPTION

[0028] Embodiment 1: A method for estimating water consumption in a watershed based on land types, using the administrative area type water consumption data from the water consumption statistical survey direct reporting management system constructed in recent years, using layer data based on land types, calculating the area of each administrative area land type, the area of the land type within the watershed range, obtaining the conversion ratio, and thus estimating the water consumption of each type in the watershed, which includes the following steps:

[0029] Step 1: Obtain administrative area water consumption data: The current year water consumption data in the administrative area is obtained from the water consumption statistical survey direct reporting management system of the Ministry of Water Resources; the total water consumption in each administrative area can be divided into four parts, namely agricultural water, industrial water, domestic water, and artificial ecological environment water.

[0030] Step 2: Obtain land type data: According to the Global 30-meter Land Cover Data (GlobeLand30) of the National Basic Geographic Information Center, generate 10 vector land type layers from the land cover image data through ArcGIS software (geographic information processing system software), which are cultivated land, forest, grassland, shrub land, wetland, water body, tundra, artificial surface, bare land, glacier and permanent snow; extract two land types related to water consumption, cultivated land and artificial surface, from the vector layer to form new land type layers, including cultivated land layer and artificial surface layer; agricultural water is considered to be strongly related to cultivated land, and industrial water, domestic water and artificial ecological environment water are considered to be strongly related to artificial surface.

[0031] Step 3: Extract the watershed range vector surface layer: Through the ArcHydro Tools module in ArcGIS software, use DEM (Digital Elevation Data) to process the terrain and perform hydrological analysis to extract the watershed range vector surface layer in.shp format.

[0032] Step 4: Obtain the area of the land type within the watershed range: superimpose the watershed range vector surface layer and the administrative area surface layer in.shp format to determine the administrative areas involved in the watershed;

[0033] Superimpose the determined administrative area surface layer on the cultivated land layer of the administrative area to obtain the cultivated land layer within the range of each administrative area, and calculate the total cultivated land area within each administrative area; superimpose the watershed range vector surface layer and the cultivated land layer within the range of each administrative area to obtain the cultivated land layer of each administrative area within the watershed range, and calculate the cultivated land area within each administrative area involved in the watershed;

[0034] Similarly, superimpose the determined administrative area surface layer on the artificial surface layer of the administrative area to obtain the artificial surface layer within the range of each administrative area, and calculate the total artificial surface area within each administrative area; superimpose the watershed range vector surface layer and the artificial surface layer within the range of each administrative area to obtain the artificial surface layer of each administrative area within the watershed range, and calculate the artificial surface area within each administrative area involved in the watershed;

[0035] Step 5, area proportion coefficient acquisition: divide the cultivated land area in the administrative area involved in the basin by the total cultivated land area in the administrative area to obtain the cultivated land area proportion coefficient of each administrative area; divide the artificial land area in the administrative area involved in the basin by the total artificial land area in the administrative area to obtain the artificial land area proportion coefficient of each administrative area.

[0036] Step 6, calculation of total water consumption in the basin: multiply the agricultural water consumption of each administrative area obtained in step 1 by the cultivated land area proportion coefficient to obtain the proposed agricultural water consumption of the administrative area allocated within the basin; multiply the industrial water consumption, domestic water consumption, and artificial ecological environment water supplement of the administrative area obtained in step 1 by the artificial land area proportion coefficient to obtain the proposed industrial water consumption, domestic water consumption, and artificial ecological environment water supplement of the administrative area allocated within the basin; add the obtained proposed agricultural water consumption, industrial water consumption, domestic water consumption, and artificial ecological environment water supplement in the basin to obtain the total water consumption in the basin.

[0037] The administrative area described in this embodiment is a county-level administrative area. The administrative area map layer can be obtained from public channels, such as the local land management bureau, the natural resources bureau, or Taobao.

[0038] Embodiment 2: The basin water consumption estimation method based on land class includes the following steps:

[0039] Step 1, administrative area water consumption data acquisition:

[0040] The current year water consumption data in the administrative area is obtained from the water consumption statistical investigation direct reporting management system of the Ministry of Water Resources, and the year 2021 is selected, and the county-level administrative area water consumption of Yunnan Province in 2021 is obtained; the total water consumption of each county-level administrative area can be divided into four parts: agricultural water, industrial water, domestic water, and artificial ecological environment water, and the specific values are shown in Figure 2

[0041] Step 2, land class data acquisition:

[0042] According to the global 30-meter land cover data (GlobeLand30) of the National Basic Geographic Information Center, the cloud cover image data of Yunnan Province is generated into 10 vector land class layers through ArcGIS software, which are cultivated land, forest, grassland, shrub land, wetland, water body, tundra, artificial land surface, bare land, glacier and permanent snow, as shown in Figure 3 Figure 4 Step 3, extraction of county-level administrative area land class area:

[0043] Step 3, extraction of county-level administrative area land class area: ​​

[0044] Through the county administrative area of the face layer (format.shp), such as Figure 5 ;

[0045] County administrative area of the face layer can be superimposed on the cultivated land and artificial surface two kinds of land layer, and can be calculated in the county administrative area of cultivated land and artificial surface area.

[0046] In this embodiment, seven counties such as Heqing County are selected, and the cultivated land layer and the artificial land layer are superimposed to obtain the cultivated land layer and the artificial land layer corresponding to the county layer, as shown in Figure 6 .

[0047] Step 4, extract the vector face layer of the basin range:

[0048] Through the ArcHydro Tools module in the ArcGIS software, the DEM is processed through the terrain and hydrological analysis, and the vector face layer of the basin range is extracted, and the specific steps include:

[0049] DEM digital elevation data acquisition:

[0050] The DEM data is obtained and downloaded from the official website at home and abroad. Taking the geographic space data cloud (http: / / www.gscloud.cn / #page1 / 3) as an example, after registration and login, it can be downloaded;

[0051] Terrain processing and hydrological analysis process:

[0052] Load the DEM data into the ArcGIS software and process it by using the ArcHydro Tools module. The processing process includes:

[0053] Fill sink processing (Fill sink);

[0054] Flow direction analysis (Flow Direction);

[0055] Flow accumulation analysis (Flow Accumulation);

[0056] Stream definition (Stream Definition);

[0057] Stream segmentation (Stream Segmentation);

[0058] Catchment grid delineation (Catchment Grid Delineation);

[0059] Catchment polygon processing (Catchment Polygon Processing);

[0060] Drainage line (river network) processing

[0061] Adjoint Catchment Processing;

[0062] Extraction of watershed-scale vector surface layers:

[0063] After the above steps, a set of processed hydrological analysis data is obtained. Taking the Yanggong River in Yunnan Province as an example, in the obtained DrainageLine layer, based on the approximate location of the Yanggong River outlet, such as... Figure 7 As shown, locate the corresponding position in the layer, click "Extract," and you will obtain a vector map layer representing the Yanggongjiang River basin area. Figure 8 As shown.

[0064] Step 5, Obtaining the area of ​​land types within the watershed:

[0065] By overlaying the watershed area vector map layer with the county-level administrative region map layer, it can be seen which counties are involved in the watershed. In this embodiment, the county-level administrative region layer is overlaid on the Yanggong River watershed area, and it is determined that the Yanggong River watershed involves three county-level administrative regions: Yulong County, Gucheng District, and Heqing County. Figure 9 As shown; by overlaying the cultivated land map layer with the administrative area map layer of these three counties, the cultivated land map layer of each county is obtained, as shown. Figure 10 As shown, the total cultivated land area of ​​each county is calculated, with Heqing County having 611 km². 2 The ancient city area is 183km away. 2 Yulong County is 646 km away. 2 ;

[0066] Overlay the watershed vector surface layer with the cultivated land layer within the areas of Yulong County, Gucheng District, and Heqing County, such as... Figure 11 As shown, a layer of cultivated land within the watershed area, including Yulong County, Gucheng District, and Heqing County, is obtained. Figure 12 As shown, the statistics yielded the cultivated land area within Yulong County, Gucheng District, and Heqing County, which are included in the watershed; the cultivated land area within the county-level administrative regions included in the watershed is 240 km² in Heqing County. 2 The ancient city area is 100km away. 2 Yulong County is 124km away. 2 .

[0067] The calculation of the total area of ​​artificial land and the area of ​​artificial land within the watershed is the same as the calculation of cultivated land area.

[0068] Step 6, Obtain the area ratio coefficient:

[0069] The cultivated land area proportion coefficient of each county can be obtained by dividing the cultivated land area of the county-level administrative region involved in the basin by the total cultivated land area of the county-level administrative region, and the artificial land surface area proportion coefficient of each county can be obtained in the same way, as shown in the following table.

[0070] Table: Area Proportion Coefficient

[0071]

[0072] Step 7, calculate the total water consumption of the basin:

[0073] The proposed agricultural water consumption of the administrative region allocated within the basin can be obtained by multiplying the agricultural water consumption of each administrative region obtained in step 1 by the cultivated land area proportion coefficient; the proposed industrial water consumption, domestic water consumption and artificial ecological environment water supplement of the administrative region allocated within the basin can be obtained by multiplying the industrial water consumption, domestic water consumption and artificial ecological environment water supplement of the administrative region obtained in step 1 by the artificial land surface area proportion coefficient; then the proposed agricultural water consumption, industrial water consumption, domestic water consumption and artificial ecological environment water supplement within the basin are added together to obtain the total water consumption of the basin.

[0074] In this example, the proposed agricultural water consumption of Yanggong River Basin in 2021 is 105 million m 3 , the industrial water consumption is 4.28 million m 3 , the domestic water consumption is 30.94 million m 3 , the artificial ecological environment water supplement is 3.96 million m 3 , and the total water consumption of the basin is 144.2 million m 3 , as shown in the following table.

[0075]

[0076]

Claims

1. A method for estimating a watershed water use based on land use, characterized by Specifically comprising the following steps: Step 1, administrative district water consumption data acquisition: collecting or formulating the agricultural water consumption, industrial water consumption, domestic water consumption and artificial ecological environment water supplement quantity in the administrative district; Step 2, land type data acquisition: through ArcGIS software, extracting the two land types related to water consumption, i.e. cultivated land and artificial surface, from the obtained vector layer to form a new land type layer of the administrative district, including a cultivated land layer and an artificial surface layer; Step 3, extracting the vector surface layer of the basin range: through the ArcHydro Tools module in the ArcGIS software, extracting the vector surface layer of the basin range through terrain processing and hydrological analysis of DEM; Step 4, obtaining the land type area in the basin range: superimposing the vector surface layer of the basin range and the administrative district surface layer to determine the administrative districts involved in the basin; superimposing the determined administrative district surface layer and the cultivated land layer of the administrative district to obtain the cultivated land layer in the range of each administrative district and to count the total cultivated land area in each administrative district; superimposing the vector surface layer of the basin range and the cultivated land layer of each administrative district to obtain the cultivated land layer of each administrative district in the basin range and to count the cultivated land area in each administrative district involved in the basin; Similarly, superimposing the determined administrative district surface layer and the artificial surface layer of the administrative district to obtain the artificial surface layer in the range of each administrative district and to count the total artificial surface area in each administrative district; superimposing the vector surface layer of the basin range and the artificial surface layer of each administrative district to obtain the artificial surface layer of each administrative district in the basin range and to count the artificial surface area in each administrative district involved in the basin; Step 5, obtaining the area proportionality coefficient: dividing the cultivated land area in the administrative district involved in the basin by the total cultivated land area in the administrative district to obtain the cultivated land area proportionality coefficient of each administrative district; dividing the artificial surface area in the administrative district involved in the basin by the total artificial surface area in the administrative district to obtain the artificial surface area proportionality coefficient of each administrative district; Step 6, calculating the total water consumption of the basin: multiplying the agricultural water consumption of each administrative district obtained in step 1 by the cultivated land area proportionality coefficient to obtain the proposed agricultural water consumption of the administrative district allocated to the basin range; multiplying the industrial water consumption, domestic water consumption and artificial ecological environment water supplement quantity of the administrative district obtained in step 1 by the artificial surface area proportionality coefficient to obtain the proposed industrial water consumption, domestic water consumption and artificial ecological environment water supplement quantity of the administrative district allocated to the basin range; adding the obtained proposed agricultural water consumption, industrial water consumption, domestic water consumption and artificial ecological environment water supplement quantity in the basin to obtain the total water consumption of the basin. The agricultural water consumption, industrial water consumption, domestic water consumption and artificial ecological environment water supplement quantity in the administrative district adopts the data in the water consumption statistical investigation direct reporting management system of the Ministry of Water Resources or the water consumption data obtained through actual investigation and statistics in the administrative district; the industrial water consumption is calculated according to the number of town centers in the county-level administrative district involved in the basin accounting for the total number of town centers.

2. The land class-based catchment water use estimation method according to claim 1, characterized by ​

Images