A Nearshore Hydrological Field Observation Device for Wandering Rivers

Abstract

The invention belongs to the technical fields of civil construction, water conservancy, and transportation, and relates to a near-shore hydrological on-site observation device for wandering rivers, including a surface flow field observation device and a near-shore river section water depth and flow velocity measurement device. The on-site observation of the device is convenient, quick, low-cost, and highly popular. At the same time, the reliability, accuracy, and safety of the observation test are guaranteed, and it can accurately measure the water depth and flow velocity at different positions on the river section, and at the same time realize the flow field visualization operations.

Description

technical field [0001] The invention belongs to the technical fields of civil construction, water conservancy and transportation, and relates to a nearshore hydrological field observation device for wandering rivers. Background technique [0002] On the one hand, the hydrological data of natural rivers are important data in the research process of many disciplines such as hydrology and river dynamics; At the same time, hydrological data serve as the basis for revealing the collapse and development of the lower reaches of the Yellow River, and provide an important basis for controlling the damage to the river bank by the wandering mainstream. Therefore, it is an indispensable and important link in the research to use on-site observation means to measure the hydrological elements of the river section and record them in the form of numbers or images. [0003] Looking at the methods of measuring the surface velocity of natural rivers at home and abroad, they can be mainly class...

AI Technical Summary

Problems solved by technology

The disadvantage is that it is time-consuming and labor-intensive and the accuracy is not high in the field observation test. It is only suitable for the approximate measurement of the flow velocity at a single point, and cannot be used for the accurate measurement of the flow velocity in a large area of ​​water

The second type of method is to use a cableway to hang a current meter on the river section. The disadvantage is that this method of flow measurement requires land acquisition, construction of a station building, installation of brackets, erection of a cableway and other supporting facilities. Station operation, high work intensity, relatively low efficiency, long construction period, coupled with the poor physical properties of the near-shore soil on the Yellow River beach, which cannot bear the weight of cableway devices and hydrological bridge testing vehicles, etc., safety issues cannot be guaranteed

The third type of method is a non-contact river surface flow field test method that uses a camera or video camera erected on the ground to collect images. Since the camera or video camera is installed on the ground, the range of the tested river surface is limited, and it is impossible to obtain orthophotos, which reduces the Test accuracy

However, the above-mentioned image measurement system is currently only used for indoor model tests

If the above-mentioned device is to be applied to the on-site observation of natural rivers, there are still the following problems: (1) The flow velocity measurement range of the above-mentioned measurement system is from 0.002m / s to 1.0m / s, and the actual flow velocity of the on-site observation is mostly beyond this scope

However, in the existing literature, there is no precedent for the combination of remote control bracket and camera for directional observation of river hydrological elements

When conducting on-site observations of rivers, cameras are often erected directly on the ground for observation. The surface range of the tested river is limited, and it is impossible to obtain orthographic images, and distortion correction of transmitted images is required.

Images