Siltation

About: Siltation is a research topic. Over the lifetime, 1420 publications have been published within this topic receiving 20983 citations.

Influence of coastal reclamation in zhangzhou port on coastal evolution of neighboring sea area

Abstract: Based on the accretion of sediment in harbor areas because of coastal reclamation nearby, the paper analyzes the landform, hydrodynamic factors, sediment and coastal evolution. According to topographic varieties before and after construction, the amount of the coastal backfill and the sediment transport data of the Jiulongjiang River are studied, and the influence on coastal evolution and siltation in the harbor are analyzed. The research shows after the coastal reclamation, the sediment deposition in the nearby harbor is due to natural silt deposition, beach accretion and muddy current caused by coastal backfill. When the coastal reclamation is finished, the new coast will reach a new balance gradually, and the deposition in the dock will also return to the natural level gradually.

Transverse and Longitudinal Eigenfunction Analysis of a Navigation Channel Subject to Regular Dredgings: The Adour River Mouth, France

Abstract: The Adour river mouth is located in Anglet, on the southwest coast of France, and it provides access to the commercial harbour of Bayonne. The navigation channel suffers from a recurring problem of silting and needs regular dredging. The construction of breakwaters and jetties has not solved the silting problem. Recently, a preventive trench was dug south of the channel to decrease the rate of siltation in the navigation channel. Bathymetric data of the river mouth were monitored for 26 mo, and 40 bathymetric sets of data were analysed. During the investigation period, four dredging campaigns were carried out. The surveys provide a very unusual bathymetric record because the sampling in time is extremely dense for such data. Eigenfunction analysis was performed along transects perpendicular and parallel to the direction of the river flow. These analyses are usually used to explain natural bathymetric or topographic evolutions. Here, there are also used to describe anthropogenic influences. The fi...

Silting of Foum El Gherza Reservoir

Abstract: The Foum El Gherza Reservoir fails to satisfy the irrigation of 300,000 palms of Sidi Okba and Seriana due to advanced siltation. Based on data from bathymetric surveys conducted by the National Agency for Dams, the siltation rate was estimated at 0.9 million m3/year. With a total capacity of 47 million of m3, the Foum El Gherza dam is silted up with more than 65 million m3. In this case, the life of the dam will not exceed 11 years of operation. The total silting of the reservoir will occur in 2023. Desilting the dam proves an emergency to save the palms of Seriana and Sidi Okba.

Selection of geo-synthetic filter materials as drain envelopes in clay and silty loam soils to prevent siltation: A case study from Turkey

Abstract: Geo-synthetic envelope materials are used in subsurface drain pipes to prevent the entry of soil particles into drains commonly installed to reclaim waterlogged salt affected lands. In-spite of its expensive cost, generally in the world, gravel and sand are traditional envelope materials to prevent the siltation in drain pipes. For this purpose, tube permeameter laboratory research was conducted for comparing geotextile with gravel and sand under the extraordinary hydraulic gradient regarding clogging and preventing siltation in the laboratory condition. Three type of geotextiles (woven and non-woven) and sand-gravel were tested on two type of soil (clay and silty loam). All geotextiles were better than sand-gravel envelopes for preventing the siltation and their clogging level did not create any risk for hydraulic conductivity. Key words: Envelopes, siltation, geotextile, sediment, hydraulic permeability, synthetic fabrics.