Method for measuring and calculating area crops water demand quantity

Abstract

The invention discloses a method for measuring and calculating water requirement of regional crops, comprising the following steps of: selecting the measuring and calculating area, invoking DEM, crop planting structure, soil type, weather factors and water requirement data of the crops about the measuring and calculating from a system database; interpolating the terrain factor data and the weather factor data to obtain a grid database set of regional impact factors; extracting comprehensive factor date having an impact on the crop water requirement from each terrain factor data, soil type data and weather factor data; establishing nonlinear mapping relationship between the comprehensive factor date and the crop water requirement to acquire the water requirement data of the different crops; the invention can use diverse space processing methods aiming at diverse impact factors, sufficiently takes account of the space variability of each impact factor, and through the change process of original data and the application of statistic theories, the invention can efficiently reduce the operation workload, improve the data analysis efficiency, and enhance the measuring and calculating precision for the water requirement of regional crops on condition of complicated terrain and sparse site.

Description

technical field The invention relates to the field of farmland water conservancy engineering, and relates to a method for measuring and calculating water demand of regional crops in farmland water conservancy and hydrology and water resource systems. Background technique At present, the water demand of crops is an indispensable basic data in the calculation of water and soil resources balance, planning, design and operation management of irrigation projects. Accurate measurement and calculation of crop water demand is not only the basic basis for formulating crop irrigation system and regional irrigation water demand plan, but also has become a key link in monitoring agricultural drought and improving regional water resource utilization efficiency. The research on crop water demand has been highly valued at home and abroad for more than 200 years. The research has proposed many measurement and calculation methods, but most of these methods are based on the calculation of cr...

AI Technical Summary

Problems solved by technology

The research on crop water demand has been highly valued at home and abroad for more than 200 years. Many measurement and calculation methods have been proposed, but most of these methods are based on the calculation of crop water demand at a single point. Since crop water demand has a large space Variability, most of these fixed-point data cannot be directly used for other points, let alone replace the average value of a larger area. The decision-making of water diversion and water transfer across river basins actually requires the water demand of regional crops at different scales

The traditional calculation method of regional crop water demand adopts the point-to-surface method, but due to the limitations of manpower, material resources, and financial resources, it is impossible for people to arrange unlimited monitoring stations, especially in areas with large terrain changes. The spatial distribution is more complex. Since the influence of terrain and other factors cannot be considered, the measurement accuracy is difficult to meet the actual work needs.

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