Method for drawing isobath of lake

Abstract

The invention discloses a method for drawing an isobath of a lake and belongs to the technical field of analysis and measurement control. The method comprises the following steps of: utilizing a simple and convenient operating instrument, such as, a ground DE2A electronic theodolite, a ruler, a bathymetry rod, a compass, a ship, and the like, to measure a complex terrain condition, and then calculating according to a sine and cosine theorem and applying CAD (Computer-Aided Design) to draw an isobath chart close to a point in the lake and draw the terrain appearance of the lake. The method has the advantages of simpleness and easiness in operation, time-saving and labor-saving property, cost-saving property, accurate measuring and calculating result, and is suitable for the preparation work performed by a surveying and mapping non-professional person before the engineering design is performed.

Description

technical field [0001] The invention relates to a lake contour surveying and mapping method, which belongs to the technical field of analysis and measurement control. Background technique [0002] At present, the main methods of isobath surveying and mapping mainly include: hammer or rod method (discontinuous bathymetry is carried out at different observation points, when the isobath map is compiled, it is assumed that the slope of the seabed topography changes uniformly, and the interpolation method is used to determine The location of the survey), echo sounding technology, continuous measurement of topographical sections, can directly determine the position of each isobath with high accuracy. [0003] Disadvantages of the hammer or rod method: only the water depth can be measured, and other means such as GPRS positioning are needed to carry out isobath mapping. [0004] Disadvantages of echo sounding: There are many influencing factors: speed of sound, time motor speed, z...

AI Technical Summary

Problems solved by technology

[0003] Disadvantages of the hammer or rod method: only the water depth can be measured, and other means such as GPRS positioning are needed for contour mapping

[0004] Disadvantages of echo sounding: There are many influencing factors: speed of sound, time motor speed, zero point, baseline, bottom slope, water temperature, etc. Professional operators are required to use it, and it needs to be used with GPRS positioning

[0007] Plateau lakes have a vast drainage area, and the measured isobaths are far away from the shore, so boats need to be used for auxiliary measurement, and the depth of silt at the bottom of the lake is insufficient, and the underlying soil is hard, so temporary marker poles cannot be used for marking

[0008] The cost of using surface piling is too high and lacks practicability

[0009] The wind force on the lake surface is strong all the year round, and the buoy method cannot be accurately positioned under the influence of the wind force

[0010] Therefore, in non-professional surveying and mapping surveys in plateau lake areas, accurate surveys cannot be performed using conventional surveying methods

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