Based on analyzing the characteristics of channel morphology and river bed evolution in the wandering Yellow River, combining the experimental results of river engineering model, it is pointed out that the further regulation of the wandering channel needs to insist on the succeeded and developed viewpoints, grasp the construction of controlling works at the same time, and also pay attention to combiningod works with egulation measures in the bending channel?
According to the wandering channel morphology, the channel is divided into some small reaches, combining integral regulation with sectionalized regulation to realize the organic unity with the wandering channel regulation.
The method has obvious advantages of higher calculation accuracy, visualized channel morphology and distinct capability of spatial analysis of scouring and siltation locations.
From the viewpoint of river engineering, ecological rehabilitation means the restoration of channel configuration, riverbed profile, lost riparian vegetation, and wetland community.
③ Investigating and analyzing the present conditions of the middle and lower reaches of the Yangtze river, it is probed into the relations of the river morphology with the geology structure of river bed and bank and with the rivers geologic action;
Outside the interception area reach (suburban reach) of Suzhou Creek, Dongdayin estuary-Beixinjing, according to the feature of river, factors of branch small towns distribution, along the reach to collect 24 sediment column samples, and deteimine the contents of CODCr and NH3-N at different sites and depths of sediment, and analyzed the distrrbution characteristics and formation of CODCr and NH,-N along the reach and virtically.
The result shows that the variation of flood water level on the middle and lower Yangtze River is closely related to river bed evolution, and that the river bed deposition and variation of channel configuration are the main reasons of water level rise and long duration of high water level.
Based on experimental data and theory, by means of simplified discharge durations in a small flume, the influence of discharge process on channel morphology and channel pattern was analyzed in this paper.
This study examines the effects of land-use changes and channel foreshortening on the sediment regime and channel morphology of two sand-bed rivers in southwestern Mississippi.
In the south, the system has the typical morphology of a turbidite deposit rich in mud and sand with a well-developed meandering canyon and channel morphology.
Vascular malformations are subgrouped, based on channel morphology and rheology: slow-flow (capillary, lymphatic, venous, or combined-complex types) and fast-flow malformations (ectasia, aneurysm, fistula, or arteriovenous anomalies).
In vitro differentiation of pleomorphic blood-stream forms ofTrypanosoma brucei to procyclic culture forms occurred rapidly and at high rates at 27°C in a culture medium containing 1 mM cis-aconitate as the transformation-inducing agent.
Quasi-linear relaxation, which should occur as the stream forms, ensures that equality ti = Δt is set up initially, and restricts the number of escaping electrons to Ns≈ 1031.
Deposits left by dense flows of tephra and wet steam as opposed to those left by dilute flows of dry steam and tephra show contrasts in median grain size, dispersal area, grain shape, grain surface chemistry, and bed form.
The dominant bed form of the surge deposits are sand waves shaped in dune forms with vertical form index of 10-20, characterized by stoss-side erosion and lee-side deposition of 1-10 cm reversely graded laminae.
When a modest sand transport (1.2 × 10-3-8.5 × 10-3 g/s·cm) was present, the near-wall coherent structures of the flow produced a bed form with a streaky longitudinal pattern.
The Hanjiang storage area of the Danjiangkou Reservoir is situated in the lower reach of the upper Hanjiang River. Naturally, the river flows in mountain gorges in this reach, and the reservoir is consequently of river-type.The Danjiangkou reservoir had been impounded to its normal high level in 1973. During the six-year period of 1973-1980, the inflow discharge was low, the storage level varied in a wide range, and the reservoir had been operated in a low level for a long period of time. Besides, there was...
The variation of erosion and deposition in the lower Wei River since the control operation of Sanmenxia reservoir is discussed in this paper. The preliminary conclusions of the author are: (1)the erosion datum of riverbed at Tongguan can be stabilized in the range of 326-327m;(2) the sediment carrying capacity of the river has been restored essentially through natural regulation of the riverbed, and present shape of the river is approaching to one before construction of Sanmenxia reservoir; (3) the depositi...
Two key points in high resolution seismic prospecting for coal are (1) to design reasonable acquisition parameters for exploration tar- get,and (2) to preserve useful high frequency components as many as possible during data processing.In the coal seismic exploration in CH basin,we used the following reasonable acquisition parameters. lms sampling interval,235m maximum offset,10m group interval and 16-250 Hz frequency band.In seismic data processing,high-pass filte- ring,band-pass filtering and time-variant...
河道形态
channel morphology
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