Regional phreatic water evaporation capacity measurement method and device based on digital elevation model

Abstract

The invention relates to a regional phreatic water evaporation capacity measurement method and device based on a digital elevation model. The method comprises the steps that ground absolute elevation values of all grids in a to-be-measured region are acquired according to the digital elevation model (DEM) of the to-be-measured region; the groundwater depths of the grids corresponding to different ground absolute elevation values are determined according to the ground absolute elevation values of all the grids; the phreatic water evaporation capacities of the grids corresponding to the different ground absolute elevation values are determined according to the groundwater depths; the phreatic water evaporation capacity of the whole region is determined according to the number of the grids corresponding to the different ground absolute elevation values in the to-be-measured region and the phreatic water evaporation capacities of the grids corresponding to the different ground absolute elevation values. According to the technical scheme, the measurement result is high in accuracy, little data is needed, data acquisition is easy, the implementation steps are simple and clear, and manpower and material resources of site investigation can be greatly saved.

Description

technical field [0001] The invention relates to the technical field of data processing, in particular to a method and device for measuring regional phreatic evaporation based on a digital elevation model. Background technique [0002] At present, groundwater environmental impact assessments such as water resources assessment, foundation pit precipitation, and mining dewatering involve fields such as groundwater development and utilization, groundwater replenishment and drainage, and require the establishment of numerical models of groundwater in corresponding areas. In the process of establishing the groundwater numerical model, in addition to the physical characteristics of the aquifer, it is also necessary to grasp the hydrogeological parameters of the area to be evaluated. Hydrogeological parameters are crucial to groundwater flow problems. Among the hydrogeological parameters, evaporative discharge is the most important way of groundwater discharge, especially in arid r...

AI Technical Summary

Problems solved by technology

Satellite remote sensing is limited by ground calibration, and it still cannot guarantee sufficient accuracy

Theoretical derivation is universal. However, in actual calculation, more detailed data and long-term experimental data support are often required to perform calculations. There are also difficulties and bottlenecks in the establishment and understanding of models.

In practical applications, due to actual conditions and limitations of manpower and material resources, many research areas often lack detailed experimental data, or only have single-point data, which cannot meet the needs of accurate calculations for regional phreatic evaporation calculations

[0004] In this case, except for areas with certain data accumulation, which can be deduced through theoretical calculations or estimated using remote sensing data, only the experience of hydrogeological workers can be used to carry out artificial parameter divisions, thus greatly increasing the number of regions. Calculation error of phreatic evaporation

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