Underwater riverbed shape real-time tracker and riverbed shape measurement method

Abstract

The invention discloses a real-time underground riverbed form tracker and a riverbed form measure method. The tracker comprises an upper computer, a lower computer connected with the upper computer and a riverbed form acquisition device connected with the lower computer. The riverbed form acquisition device comprises a transverse motion mechanism fixed in a tracker shell, a longitudinal motion mechanism and a sensor arranged on the longitudinal motion mechanism. The tracker can measure the underground riverbed form quickly, accurately and automatically, and has the advantages of reasonable and simple structure, convenience and quickness in use, low cost, small size and the like.

Description

technical field [0001] The invention relates to an underwater riverbed shape real-time tracker and a riverbed shape measurement method. Background technique [0002] If the bed surface of the test tank is covered with gravel, the bed surface will be scoured or deposited under the action of water flow. Such a test is called a moving bed tank test. The moving bed flume test is mainly used to simulate the river bed evolution process of natural rivers, so as to carry out the research work on the theory of water and sand movement. Therefore, the extraction of bed shape information during the test is particularly important. The real-time terrain measurement has high requirements on the equipment, not only to be able to carry out underwater operations, but also to measure quickly and achieve high precision without causing obvious damage to the bed surface. [0003] The traditional topographic surveying equipment is level, stylus, total station and RTK, etc., which have certain re...

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Problems solved by technology

[0003] The traditional topographic surveying equipment is level, stylus, total station and RTK, etc., which have certain requirements for indoor light, and require a lot of manpower to measure point by point. The earth affects the measurement accuracy, and its error may reach several centimeters

At the same time, the stylus or ruler needs to touch the river bed, which is easy to cause damage to the bed surface

In addition, semi-automatic equipment with data storage functions such as total stations and RTK cannot be used for topographic surveys under certain water depth conditions

Therefore, at present, most of the flume tests cannot realize topographic measurement, and can only carry out topographic measurement after the test is over.

A few devices capable of real-time topographical measurement, such as sonar equipment, are mainly used for underwater 3D topographical mapping in the marine field. The measurement range is extremely large, but the accuracy is low, and the error cannot be controlled within 1cm; Measuring equipment, which decodes and calculates phases through images, has the disadvantage of being unable to perform topographic measurements at a certain water depth; other laser equipment is bulky, requires a special track, and is expensive to build and maintain.

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