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Mathematical modelling of sediment dynamics and their deposition in Lithuanian rivers and their deltas (case studies)

Vaikasas, Saulius

Journal of environmental engineering and landscape management, 2010-09, Vol.18 (3), p.207-216 [Revista revisada por pares]

Taylor & Francis Group

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Título:
Mathematical modelling of sediment dynamics and their deposition in Lithuanian rivers and their deltas (case studies)
Autor: Vaikasas, Saulius
Materias: Deposition ; Floods ; Flow velocity ; hidraulinis modeliavimas ; hydraulic modelling ; Mathematical models ; nešmenu reguliavimas ; regulation ; riverbed process floodplains ; Rivers ; sediment dynamics ; Sediments ; užliejami sleniai ; vaginiai procesai ; Valleys ; Water pollution
Es parte de: Journal of environmental engineering and landscape management, 2010-09, Vol.18 (3), p.207-216
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descripción: Mathematical modelling of sediment transport and deposition in the floodplains and canals of rivers is closely related to the hydrodynamics, as well as the design of engineering measures, of water pollution control and reduction. The dynamics of flow velocities and water level in the urban section of the Nevežis River at Kedainiai were estimated by applying a hydraulic-mathematical model, DELTA. It was established that there were no conditions for undesirable river-bed siltation. During the dry season (Q v.f = m 3 /s), flow velocity did not exceed 0.5 m/s in the study section. When the discharge affected the formation of the riverbed (Q v.f = 70 m 3 /s), the flow velocity reached 1.2-1.3 m/s and accumulated bed sediments were washed away. A two-meters high dam near Skongalis does not stimulate bed silting, as it is not high enough to have much influence on the bed formation processes or the reduction of riverside overgrowth. When the water level is low and the flow velocity is small (0.1 m/s), the water in the river is only slightly turbid (turbidity is 2-6 mg/l), so there is no scope to decrease sedimentation in this case. To improve the aesthetical view of the river, it is advisable to regulate the riverbed by reducing the river width to a 30 m maximum. Floods in the Nemunas delta inundate the bright areas of the valley, where the significant amount of sediments brought by the water is deposited. This decreases the water pollution entering the Curonian Lagoon and the Baltic Sea. It is, therefore, desirable to find ways to intensify this deposition and to put them into practice. The possibility of increasing the discharge of water flowing through the flood plane was investigated, applying the DELTA model. The influences of road banks built across the floodplain and the growth of bushes in the valley were tested. They cause increases in depth and decreases in flow velocity, which can alter the amount of sediment deposition.
Editor: Taylor & Francis Group
Idioma: Inglés;Lituano

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Mathematical modelling of sediment dynamics and their deposition in Lithuanian rivers and their deltas (case studies)

Vaikasas, Saulius

Taylor & Francis Group

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