File:PipingScheme.jpg
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Summary[edit]
| Description |
English: 1. Water flows trough the sand layer under the dike and well up behind the dike. A well is formed.
2: The water flowing under the dike transports sand. This sand is deposited on land behind the dike and forms a sand boil. A pipe is formed, the length of the pipe depends on the waterlevel difference between river level and waterlevel inland 3: At a certain length of the pipe the erosion increases progressively because of decrease of hydraulic resistance, this is due to the fact that the length of the pipe increases. 4: When a connection is formed with the river, the flow increases and transports more sand. Caveties may be formed under the dike, causing subsidence of the crest and leading eventually to dike breaching.Nederlands: 1: Water stroomt door een zandlaag onder de dijk door en komt achter de dijk naar boven, er ontstaat een wel
2: Het water dat onder de dijk doorstroomt neemt zand mee en zet dit af op de slootbodem of op het maaiveld achter de dijk, dit is een zandmeevoerende wel. Er onstaat een pijp. De lengte van de pijp is afhankelijk van het verval over de dijk. 3: Bij een bepaalde lengte van de pijp neemt de erosie progressief toe, dit komt omdat de weerstand door de toename van de pijplengte afneemt. 4: Als er een verbinding met het buitenwater is gevormd gaat het water sneller stromen en neemt nog meer zand mee, de ontstane holte onder de dijk kan zo groot worden dat de dijk gaat verzakken; dit kan tot doorbraak leiden. |
| Date | |
| Source | Own work |
| Author | Henk Jan Verhagen |
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|---|---|---|---|---|---|
| current | 11:32, 18 February 2020 | | 928 × 1,462 (72 KB) | HJVerhagen (talk | contribs) | User created page with UploadWizard |
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