Method for online measurement of air flux of air-water interface of river

Abstract

The invention provides a method for online measurement of air flux of an air-water interface of a river, relating to the field of environmental protection and comprehensive utilization of resources. The method aims at improving the measurement speed and precision and expanding the applicable scope of the flux-chamber-based measurement method, and the method is characterized in that a plurality of flux chambers are distributed along the direction of the stream by virtue of hang ropes and hooks according to the Gaussian integration nodes, the flux chambers are connected with a gas analyzer by a ventilation hose and an electromagnetic flux valve one by one, and the ratio of ventilatory capacity of each flux chamber is distributed by the electromagnetic flux valves according to the ratio of the weights of the local integral points, and as a result, the air flux of the air-water interface of the river can be quickly and accurately measured in an on line manner.

Description

technical field [0001] The invention relates to the fields of environmental protection and resource comprehensive utilization, in particular to an online measurement method for gas flux at the water-air interface of a river. Background technique [0002] In order to ascertain the changes in the absorption and emission of greenhouse gases in waters and their impact on the environment under the condition of global warming, it is necessary to analyze and study the gas flux at the water-air interface. At present, most of the research on greenhouse gas emissions in water areas is based on the flux that diffuses into the atmosphere through the water surface. The mechanism has developed various monitoring methods for greenhouse gas fluxes, the main categories include model estimation method (stoichiometric method), flux box method, micrometeorological method, remote sensing inversion method, etc. Among them, the flux box method is moderately priced and can quickly The transportati...

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Problems solved by technology

However, if the bottom area of ​​the flux box is increased, it is inconvenient to carry and is not suitable for long-term field monitoring. At the same time, the volume of the flux box will be increased, which will cause too long sampling time and affect the monitoring efficiency. Furthermore, the wall of the flux box and the water surface will also be increased. friction, too much artificially changing the turbulence, the measured diffusion flux will deviate from the actual

It is not easy to measure when the flux box freely moves with the water on the lake and river surface. First, in the case of real-time online measurement, the instrument is heavy and difficult to drift with the flux box. In addition, for rivers with more human interference, the drift scheme It is impossible to avoid sailing ships, cargo ships, etc., and it is easy to cause harm to surveyors and measuring instruments. Therefore, it is necessary to adopt new methods and equipment to improve the measurement accuracy of water-air interface flux under dynamic conditions in the river.

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