Method of measuring gravel bed load transport rate based on electromagnetic induction principle

Abstract

The invention discloses a method of measuring a gravel bed load transport rate based on the electromagnetic induction principle. According to the method, a tracer agent based on the electromagnetic induction principle is embedded into sediment particles, and the ratio of the tracer agent sediment particles is adjusted according to a gravel bed load sediment grade in a measured reach, so that the measured reach is consistent with a natural riverway; the tracer agent sediment particles are numbered, the numbered tracer agent sediment particles are spread in a dredging pit in front of a characteristic point on a riverway cross section, a land tracking device of the electromagnetic tracer agent is started, and moving traces and corresponding time of the different sediment particles are recorded; based on a recorded gravel bed load moving process, the bed load transport rate at the characteristic point on the riverway cross section is obtained; and flow velocity distribution on the riverwaycross section is measured, the bed load transport rate at the characteristic point is transformed to the whole cross section according to the flow velocity distribution, and then the gravel bed loadtransport rate on the riverway cross section is obtained. Through the method, the gravel bed load transport rate in the natural riverway can be measured, and the along-the-way bed load transport ratecan be observed.

Description

technical field [0001] The invention relates to a method for measuring the sand transport rate of pebble-moving mass based on the principle of electromagnetic induction, and belongs to the technical field of river sediment movement mechanics. Background technique [0002] Pebble mass exists in natural rivers in large quantities, especially in mountainous rivers. Rivers in mountainous areas have the characteristics of large gradient and sharp rise and fall of flood peaks. During the flood season, the flow velocity of the river channel increases rapidly, and a large number of pebbles are transported to the downstream of the river channel under the action of the water flow, forming siltation on the widened channel or beach, changing the flow pattern of the water flow. For navigable rivers, due to the passage and siltation of pebbles, the water depth of the river changes drastically, which may hinder navigation locally and threaten the safety of navigation. The accumulation of...

AI Technical Summary

Problems solved by technology

When the transported sediment rate is high, the transported sediment passing through the section per unit time is more, and it is difficult to collect a large amount of sediment. Therefore, this method is not widely used in practice.

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