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Transport rumowiska przez przepusty drogowe

100%

Bajkowski S.

Przegląd Naukowy. Inżynieria i Kształtowanie Środowiska

2008

tom 17

nr 2[40]

The main areas on water structures in which sediment gathers are headwater, hollows in construction and tailwater. The processes of accumulation of upstream and downstream positions develop according to duration of the object’s exploitation. This article analyses working conditions of an elongated pipeline of culvert in Potok Służewiecki stream. These conditions were examined with the aim to evaluate the degree of discharge limitation of the object by the pipeline executed below an old construction of a road culvert under Łączyny street. The object of investigation is an old culvert under Łączyny Street to which pipeline was added. In the assembly chamber, on the rout of pipeline, a rainy collector is connected to the culvert. It is characterized by high changeability of transverse sections, bed line slopes and hydraulic conditions. An old section of the culvert has the largest capacity. The trash screen is another element that considerably reduces the capacity of the object. The tendency to segregating rubble occurs in the section of culvert. The largest sediments gather in the headwater position, near the outlet – the smallest. In the stream below the object sediments have a similar material composition to the one in the upper position. The theoretical curves of longitudinal line of slope counted with formula (2) divide the area of Fig. 2 in three zones. On the left and below the curve Jn37 the accumulation zone is located, in which the movement of sediment does not occur. Above the curve Jn60 in the right the zone of intensive sediment transport appears. Among the curves Jn37 and Jn60 the transitory zone is located, correspondive to the conditions in which erosive processes begin with growing intensity of fl ow or accumulation processes, when fl ow diminishes. For the fl ows, for which the counted gradient is larger than the gradient of water surface the diffi culties with transportation of sediment through the object may occur. In the opposite situation the transportation should continue without obstacles. Exceeding this fl ow does not guarantee, however, that an intensive carrying out of earlier accumulated bed material happens. The appearing of rinsing fl ows is an accelerating factor to this process.

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1 Przegląd Naukowy. Inżynieria i Kształtowanie Środowiska

1 Bajkowski S.

1 2008

Wyniki wyszukiwania

Transport rumowiska przez przepusty drogowe