River Dredging
Dredging is mostly used for waterway management, including dredging, widening and cleaning existing waterways, dredging river dredging and removing underwater obstructions. The purpose is: first, dredging the river, increase the longitudinal ratio drop and the river's ability to drain sand, reduce the rate of siltation in the river, to ensure flood control safety; second, dredging sand to lower the river, reduce the elevation of the riverbed, maintain a certain water depth, to facilitate navigation.
Purpose of River Dredging
The world's great rivers implement dredging and dredging, the purpose is just two, one is to dredge the river, increase the longitudinal ratio drop and the river's ability to discharge sand, reduce the rate of siltation of the river, to ensure flood control safety; the second is to dredge and lower the river, reduce the elevation of the riverbed, maintain a certain water depth, to facilitate navigation. The situation of the Yellow River is special, because the incoming water shows strong seasonality and the dramatic evolution of the river, the lower reaches of the Yellow River can not be used as a navigation channel. Therefore, the purpose of dredging and dredging in the Yellow River is very clear, that is, in the Yellow River hydrodynamic sand transport role is increasingly weakened, the main channel of the siltation of the situation, the use of dredging and dredging methods, in order to increase the river's sand transport capacity, reduce the siltation of the river, to rationalize the river; and dredged sediment for strengthening the embankment, with other measures, and gradually make the Yellow River downstream to form a relatively underground river, change the above-ground The passive situation of hanging river.
River Dredging principles
There are many factors affecting the effect of dredging and silt reduction, and the location of the project or the dredging section is one of them, if the selection is not proper, the effect of silt reduction will not appear; if the selection is proper, the benefit of silt reduction can be maximized. Therefore, the selection of dredging section is very important. According to the practical experience of three river dredging projects implemented in the estuary from 1997 to 2004 and the results of the prototype observation study, the selection of the dredging section should follow several principles:
① the main river channel is relatively stable, and it is not easy to occur such phenomena as rolling river;
② it can play the role of dredging the river bed and smoothing the river channel;
③ it can reduce the erosion base, shape the anadromous scour as much as possible, and have a favorable impact on the upstream, as much as possible to shape the anadromous scour, the river channel has a favorable impact;
④ not easy to resilt, can maintain the long-term benefits of dredging;
⑤ sediment can be effectively used.
Trodat has nearly 30 years experience of providing dredge accessories and manufacturing dredge.
We will provide you a quality solution with competitive price as long as you tell us your project information.
Shawn@trodatgroup.com
