Topic
Siltation
About: Siltation is a research topic. Over the lifetime, 1420 publications have been published within this topic receiving 20983 citations.
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TL;DR: Dhaka is located on extensive sub-continental floodplains of the Ganges and the Brahmaputra with average elevation of 6 m above mean sea level (MSL).
Abstract: Dhaka has one of the fastest urban growth rates of the world with around 12 million people in 2006. It is located on extensive sub-continental floodplains of the Ganges and the Brahmaputra with average elevation of 6 m above mean sea level (MSL). It is surrounded by four rivers with well distributed streams, drainage channels, inland and open waters. Physiographical, spatial and temporal environments of these waters profoundly influence inhabitants' life. Mass shrinkage has occurred during the last four decades due to encroachment and filling-up, man-made changes in elevation pattern and siltation with debris from urban development activities. Groundwater storage is on the verge of mass threat because of increasing pollution of surface waters. Water logging has become every-rainy season phenomenon due to unplanned urbanization. Development activities are required to enhance the water environments safe and sustained, and regulations are needed to be imposed to protect these environments.
3 citations
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TL;DR: In this article, the result of the experiment and siltation analysis of Xiamen Harbor deep waterway engineering shows that the total silting in 58km long deep channel is about 280×104m3/a, in which the shoal of Muqianjiao reef on Haicang waterway and the shallow to the south of Houyu Islet on Songyu-Gulangyu waterway still are of more deposition rate.
Abstract: The result of tidal current experiment and siltation analysis of Xiamen Harbor deep waterway engineering shows that the total silting in 58km long deep channel is about 280×104m3/a, in which the shoal of Muqianjiao reef on Haicang waterway and the shallow to the south of Houyu Islet on Songyu-Gulangyu waterway still are of more deposition rate. Because of the west end of Haicang dock is 700m off the nature coastline, it likes a jetty to induce a big scale vortex current in the port basin. It not only increases the siltation of waterway but also influences the ship navigation. After a strong wind wave process, the calculating result shows that the deposition rate is not too seriou. It is nearly 9.0 cm/a in outer waterway, less than 5.0 cm/a in inner waterway, and only 2.5cm/a in port basin.
3 citations
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TL;DR: In this article, double guiding dykes, long enough to cut off the high turbidity belt along the coast, are examined as the main strategy to control sedimentation of the river mouths.
Abstract: The present Yellow River delta has developed over the past 150 years as a consequence of siltation and avulsions of the river channel,flooding and sedimentation.Human activities have also sharply changed the delta processes.Oil fields and a new city with a modern infrastructure have been developed on the newly created land.The river channel within the delta is very dynamic.Humans stabilize the river channel by dredging and building levees for construction of the oil field infrastructure and residences.Moreover,the sediment is being used for land creation.To control flash flood humans have dug many drainage channels to discharge flood from the Haihe River and its tributaries.Nevertheless,the number of river mouths is proportional to the ratio of water and sediment under natural conditions.The number of river mouths is too large and tidal flow carries sediment into the river mouths and caused the river mouths shrinking.Dredging is only a temporary solution to this problem.Double guiding dykes,long enough to cut off the high turbidity belt along the coast,are being examined as the main strategy to control sedimentation of the river mouths.The shallow high turbidity belt along the Bohai coast can be changed into land if numerous guiding dykes are constructed.
3 citations
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TL;DR: In this paper, a siltation problem at Gordon's Bay harbour is presented and the methods used to collect field data for a proposed model analysis are described, followed by an analysis of the possible modes of sediment transport; namely wave action, transient and steady-state currents and wind action.
Abstract: Summary A siltation problem at Gordon's Bay harbour is presented and the methods used to collect field data for a proposed model analysis are described. Characteristics of bed form and littoral materials within and around the harbour are dealt with, followed by an analysis of the possible modes of sediment transport; namely wave action, transient and steady-state currents and wind action. The results of direct bed drift measurements, as yet incomplete, are correlated with all other data in a tentative ‘sediment balance’.
3 citations
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TL;DR: In this paper, the authors discuss the effect of erhebliche Sedimentation and Verlandung in Talsperren, eingeschränkt oder sogar bedroht.
Abstract: Talsperren gelten als besonders nachhaltige und langlebige Infrastrukturen. Tatsächlich sind viele Stauräume jedoch durch teils erhebliche Sedimentation und Verlandung in ihrem Betriebsbereich eingeschränkt oder sogar in ihrer Funktion bedroht. Gleichzeitig kommt es durch Sedimentmangel stromabwärts zu erheblichen Erosionsschäden. Deshalb stellen Kritiker bisweilen sogar die Sinnfrage bei der Erweiterung bestehender oder beim Bau neuer Stauwerke.
3 citations