New method for reducing silt of large and medium tidal range river mouth bar sand section channel

Abstract

The invention belongs to the field of waterway transportation science and technology, and relates to a new method for reducing silt of a large and medium tidal range river mouth bar sand section channel. A beach reservoir is built nearby the channel, and the dyke of the reservoir is provided with a water taking gate and a water draining gate; and by using the power of natural tidal range, the water with low sand content on the outer marine surface layer is filled into the reservoir through the water taking gate at a high tide level, and then the water is injected into the channel at a low tide level, so that the method plays an effective role in silt reduction of the channel. The method comprises the following steps of: (1) filling the water with low sand content on the outer marine surface layer into the reservoir through the water taking gate at the high tide level; (2) closing the water taking gate; (3) injecting the water into the channel which needs silt reduction through the water draining gate at the low tide lever; (4) closing the water draining gate when the water injection is finished; and (5) circulating the 1st step after the 4th step is finished till the channel which needs silt reduction achieves silt reduction. According to the method, the sand in the channel is taken away through clean water to effectively reduce the silt of the channel; and effective silt reduction of the channel is realized by adjusting the flow of the water in the channel.

Description

technical field [0001] The invention proposes a new idea and a new method for reducing silt in estuary channels with large and medium tidal ranges, and belongs to the technical field of water transportation. Background technique [0002] With the rapid development of the shipping industry, there are more and more waterway development projects in the sandy section of the estuary. There are many foreign examples of channel development in the estuary of estuaries, such as the development of the channel of the Mississippi Estuary and the Columbia Estuary by the United States; the development of the channel of the Elbe Estuary by Germany; the development of the channel of the Seine Estuary by France; the development of the channel of the Rhine Estuary by the Netherlands; Development of the Lawrence Estuary Channel and India's development of the Hooghly Estuary Channel, etc. After the reform and opening up, my country has also accelerated the development of estuary waterways, suc...

AI Technical Summary

Problems solved by technology

[0013] Usually, for some estuaries with simple types, small tidal range, little sand or low water depth requirements, the above four methods can basically solve the problem of channel back-silting in the sand bar. For estuaries with sand, complex waterways and high water depth requirements, it is often impossible or difficult to achieve the remediation goals through these measures alone. Even if the remediation goals are achieved, the long-term maintenance costs of the waterways are difficult to bear

Therefore, how to solve the problem of backsilting of the sand channel in the estuary with large and medium tidal ranges through other feasible measures on the basis of the existing treatment methods has become a problem that construction, design and scientific research personnel are very concerned about. Few success stories to learn from

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