Översvämningskartering av Vombs ängar
ClimatologyNaturgeografiCartographyVomb meadowsFloodingPhysical geographyMappingPedologyGeomorphologyMarkläraGeomorfologiKartografiKlimatologiEarth and Environmental Sciences
Vomb meadows is an area well knows for its rich bird life. During the 19:thcentury until mid 20:th century, the meadows were flooded annually in order toincrease the hay yield. The river Klingavälsån situated along the west side of themeadows, used to be a shallow river, meandering across the landscape. In the1940?s the river was straightened and made deeper. This was done in purpose ofdraining the area around the river, thus enabling agriculture. The effects were thatVomb meadows dried up, and many of the popular bird species disappeared fromthe area.Today the meadows are flooded again. The municipality of Lund has in a projectduring 1999 and 2000, re-dug part of the river. It has through this regained theformer shallow bottom and the meandering shape; now flooding at 3 m3/s insteadof the earlier 6 m3/s. As a consequence, the groundwater level has also beenraised.The result of the project has been evaluated by mapping the extent of the floodingand comparing these maps with the flow in Klingavälsån. Three maps have beenmade and the flow has been measured on five different occasions.The spring of 2002 had a lot of precipitation and the meadows were floodedduring long periods. The floods were relatively evenly distributed over themeadows. Water was mainly concentrated around ditches and in the northern partof the meadows where the ground level is flatter and lower. The flooding variedwith the flow in Klingavälsån, thus depending on the precipitation. The highflows have also created erosion in the brinks of Klingavälsån, creating goodpossibilities for a continuing natural meandering of the river. The flows of themagnitude that took place this year in Klingavälsån are calculated to occur aroundevery ninth year.There are other measures to increase the flooding of Vomb meadows. To decreasethe groundwater gradient, dams can be built in the river. Big stones and rocksplaced in the river channel decrease the velocity of the river and therefore also itsdrainage capacity, thus leaving more water standing on the ground surface.Channels can be dug from the river in to the meadows, increasing the supply ofwater when the level of the river is high enough.