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Bentonite mats allow fish to migrate
| 题名： | Bentonite mats allow fish to migrate |
| 正文语种： | eng |
| 摘要： | The Schwabentorwehr (Swabian Gate Weir) in Freiburg im Breisgau, Germany, was in disrepair and insurmountable for fish. With the help of bentonite mats, the fish now have a free run again. The historic Schwabentorwehr on the Dreisam River was a federally listed building for monument protection. However, the 1873-constructed building was not only in disrepair but was an obstacle to the migration offish. To improve the site while preserving its historic character, a natural fish ladder was added to replace the ten steps of the weir's ramp, which was impassable for fish. A bentonite mat/geosynthetic clay liner (GCL) was installed under the revetment to act as a water barrier and seal the protected structure. The European Union (EU) Water Framework Directive stipulates ecological continuity. While other locations used fish bypasses along the river, the layout of the Schwabentorwehr in the middle of Freiburg im Breisgau prevented this. There were a public footpath, a cycle path, federal roads (one on each side of the site) and residential buildings. Planners had no choice but to rebuild the structure. |
| 出版年： | 2021 |
| 期刊名称： | Geosynthetics |
| 卷： | 39 |
| 期： | 4 |
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