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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01 Jan 2000
TL;DR: A fish aggregating device made of aquatic weeds and grass (Phoom) is used in Loktak lake in the northeastern region of India as mentioned in this paper, which has been used successfully in this very productive fishery for centuries.
Abstract: A fish aggregating device made of aquatic weeds and grass (Phoom) is used in Loktak lake in the northeastern region of India. It has been used successfully in this very productive fishery for centuries. Today, the fishery itself is under pressure from overexploitation, soil erosion leading to siltation and a hydroelectric project that has blocked the migratory route of the fish that used the lake as a breeding ground.
15 citations
Journal Article•
15 citations
TL;DR: The Digital Elevation Model (DEM) based on historical sea-charts and on-site hydrological records were used to examine the morphological change of the Elbe River estuary as discussed by the authors.
Abstract: The Digital Elevation Model (DEM) based on the historical sea-charts and on-site hydrological records were used to examine the morphological change of the Elbe River estuary. The results show that siltation predominated in the tidal flat in the northern estuary, with a net siltation rate of 1.8 cm·a−1 during 1927–2006. In contrast, a continuous erosion prevailed in the main river channel, south of the estuary, with a net erosion rate of 2.5 cm·a−1 in the same time. In addition, a seaward shift of the estuarine island has happened with the old island coalescing to the northern tidal flat and new one emerging through siltation process. The tidal asymmetry via ebbing flow (maximum at 140 cm·s−1, and average at 76 cm·s−1) prevailed in the tidal flat, meaning continuous aggradation northwestward, while flooding flow (maximum at 100 cm ·s−1, and average at 67 cm·s−1) dominated in the main river channel with deepening thaweg at south, showing a landward sedimentation via the tidal pumping processes. This dextral extension of the estuarine morphology is due to the Coriolis force, leading to the inconsistent directions of in-out flows, which enables to facilitate the estuarine siltation. Human dredging prevailing in the estuary has dramatically altered the nature of the silted river channel to erosional since the last century. This is characterized by a net erosion rate of 3.2 cm·a−1 derived from the DEMs mapping, but only partially accounting for the dredging amount of 1994–2006, when the total dredging volume was 67 × 106 m3, equal to 5.9 cm·a−1.
15 citations
Journal Article•
TL;DR: The use of cartography and air photographs of several dates establishes a rhythm of verified siltation in the last century, which reflects a loss of lagoon surface area of about 9,600 m 2 /year as discussed by the authors.
Abstract: The Obidos Lagoon, oriented northwest-southeast, developed perpendicular to the shoreline and communicates with the ocean through a narrow and shallow channel that needs constant dredging. This lagoon system was until the 18th century represented on the charts as an estuary which allowed navigation. Historic references indicate that the baymouth bar was formed during the medieval period, creating problems of inlet siltation. The use of cartography and air photographs of several dates establishes a rhythm of verified siltation in the last century, which reflects a loss of lagoon surface area of about 9,600 m 2 /year.
15 citations
TL;DR: In this article, the choice of powdered glass, containing 48Sc as a physical tracer for following the underwater movement of sand and silt, is discussed, and two experiments are described to show its application to the study of river siltation and of the offshore movement of the sand on the sea-bed.
15 citations