Anisotropic Basin Surface Roughness Measurement for Irrigation Simulation
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Solution Overview
Problem
Current methods for measuring anisotropic basin surface roughness are limited, as they typically assume isotropic conditions when shallow furrows and crop planting directions are at rotation angles with the basin ridges, leading to reduced simulation precision and evaluation accuracy of surface irrigation systems.
Innovation Solution
A method involving preselection of experimental strip fields parallel and perpendicular to the basin's length and width directions to acquire isotropic surface roughness, which is then used in an elliptic equation to calculate anisotropic surface roughness components, improving the representation of water flow resistance and simulation precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If isotropic basin surface roughness measurement method is used when shallow furrows and crop planting direction form rotation angle with basin ridges, then measurement simplicity is maintained, but simulation precision and evaluation accuracy are greatly reduced
Solution Approach 1:
The patent transitions from one-dimensional isotropic roughness measurement to two-dimensional anisotropic roughness measurement by introducing directional components. The anisotropic roughness model incorporates both magnitude and direction information, allowing accurate representation of surface resistance when furrows and crops are at rotation angles to basin ridges, thereby resolving the contradiction between measurement simplicity and simulation precision.
Solution Approach 2:
The patent changes the measurement parameters from a single isotropic roughness value to multiple anisotropic roughness parameters including directional components. By measuring roughness in different directions (parallel and perpendicular to basin ridges) and calculating the rotation angle, the system accurately captures the directional resistance characteristics, improving simulation precision while maintaining operational feasibility through systematic measurement procedures.
2Device complexity
If isotropic basin surface roughness is used to replace anisotropic basin surface roughness, then measurement complexity is reduced, but evaluation accuracy of irrigation system performance is greatly reduced
Solution Approach 1:
The patent segments the surface roughness measurement into directional components, measuring roughness separately in different orientations (parallel and perpendicular to basin ridges). This segmentation allows the system to capture the anisotropic characteristics of surface resistance, improving evaluation accuracy while keeping the measurement process manageable through structured segmentation of the measurement task.
Solution Approach 2:
The patent develops a universal anisotropic roughness measurement method that can handle various field conditions, including cases where furrows and crops are at any rotation angle to basin ridges. The method provides a multi-functional solution that works for both aligned and rotated configurations, improving reliability without requiring separate measurement systems for different scenarios.
Data Source
AI summary
The present invention belongs to the technical field of irrigation and water conservancy, and discloses a method for acquiring anisotropic basin surface roughness and use thereof. The method includes: preselecting two experimental strip fields respectively parallel to length direction and width direction of a target basin, to respectively acquire first surface water flow advancing process data of the two experimental strip fields, where the target basin may be regarded as a square-shaped field; acquiring two pieces of isotropic basin surface roughness respectively by using one-dimensional complete hydrodynamic model for basin irrigation according to the surface water flow advancing process data; and substituting the isotropic basin surface roughness into an elliptic equation that anisotropic basin surface roughness satisfies, to solve anisotropic basin surface roughness of the target basin, the anisotropic basin surface roughness including basin surface roughness components parallel to and perpendicular to shallow furrows on basin surface and crop planting direction in the target basin. The anisotropic basin surface roughness can truly reflect the resistance of the basin surface against the water flow, thereby improving simulation precision of surface irrigation hydrodynamics, and acquiring more accurate irrigation performance indexes.