Difference between revisions of "Thur"

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=Thur=
 
=Thur=
  
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<googlemap version="0.9" lat="47.5919253276985" lon="8.76691818237305" zoom="15" width="100%" height="400" scale="yes" overview="yes" toc="no" controls="large">
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<googlemap version="0.9" lat="47.592" lon="8.76514" zoom="13" width="100%" height="400" scale="yes" overview="yes" toc="no" controls="large">
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(A) 47.5919253276985, 8.76691818237305</googlemap>  
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(A) 47.592, 8.76514
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</googlemap>
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<Forecasterlink type="getProjectInfoBox" code="262" />
  
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<Forecasterlink type="getProjectInfoBox" code="22" />
 
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==Key features of the case study==
 
==Key features of the case study==
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Redevelopment of natural course.
 
  
 
==Site description==
 
==Site description==
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'''Attention:''' ''The information presented below has been reproduced from the ECRR brochure''<ref>European Centre for River Restoration (ECRR). 2008. ECRR Addressing practitioners [[Media:ecrrbrochure.pdf|(original document in English)]]</ref>.
 
  
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The Thur river is one of the main rivers in the Cantons St. Gallen, Thurgau and Zürich in Switzerland. It has a lenght of 127 km and a catchment area of 1,750 km<sup>2</sup>. The highest point is the summit of Säntis at 2,551 masl. The 100 years flow is estimated at 1,350 m<sup>3</sup>/s, the lowest runoff is 2,24 m<sup>3</sup>/s, and the average flow is 47 m<sup>3</sup>/s. The Thur  is a wild river with no lake or dam or big floodplain for retention.
 
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The first flood control works were constructed in the second half of the 19th century. Today, the ancient dikes and other measures applied in the late 19th century no longer adequately cope with modern discharge conditions, mainly due to insufficient heights, inappropriate construction materials, and poor maintenance. The river bed has been filled with sediment deposits, limiting discharge capacity and increasing flood peaks, while the increased human occupation of the valley in some places limits the extent of the floodplain and interferes with surface roughness (trees) in others.
 
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==Measures selection==
 
==Measures selection==
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After the catastrophic flooding due to the breaking of the dikes in 1978, urgent response measures included the repairing and heightening of the dikes and the removal of
 
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surface layer sediments from the confined stream bed. The increased attention paid to ecological aspects in later years resulted in a removal of the old stonewall parallel
 
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to the stream bed, while groynes were build in combination with obliquely placed blocks and willow trees.
 
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The resulting variety of river works provide both protection while allowing the river a greater freedom to spread and move over a length of 1,500 m and a width of 500 m.
 
  
 
==Success criteria==
 
==Success criteria==
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The new design of the river was successfully tested by the flood of 1999 (Q 1,000m<sup>3</sup>/s), in which only a few blocks were moved downstream, and no extensive repairing appeared necessary.
 
  
 
==Ecological response==
 
==Ecological response==
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Fish species like the ''Chondrostoma nasus'' and bird species like the ''Actitis hypoleucos'' found new habitats within the new river landscape.
 
  
 
==Hydromorphological response==
 
==Hydromorphological response==
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<br>
 
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[[Image:Thur_river_before_after_photos.png|400px]]
 
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<br>
 
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Over the length of the project, the Thur river has redevelop its natural course, in which erosion and sediment deposition processes freely alternate. Scours and rapids as well as wandering gravel
 
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beds have once again become a part of the river.
 
  
 
==Monitoring before and after implementation of the project==
 
==Monitoring before and after implementation of the project==
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==Extra background information==
 
==Extra background information==
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==References==
 
==References==
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<references/>
 
<references/>
  
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== Related Measures ==
 
== Related Measures ==
  
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<Forecasterlink type="getMeasuresForProject" code="22" />
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<Forecasterlink type="getMeasuresForProject" code="262" />
  
 
== Related Pressures ==
 
== Related Pressures ==
  
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<Forecasterlink type="getPressuresForProject" code="22" />
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<Forecasterlink type="getPressuresForProject" code="262" />
  
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[[Category:River depth and width variation]] [[Category:Structure and substrate of the river bed]] [[Category:Structure of the riparian zone]] [[Category:Fish]]
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[[Category:Quantity and dynamics of water flow]] [[Category:Connection to groundwater bodies]] [[Category:River continuity]] [[Category:River depth and width variation]] [[Category:Structure and substrate of the river bed]] [[Category:Structure of the riparian zone]] [[Category:Structure of the floodplain]] [[Category:Phytoplankton]] [[Category:Macrophytes and phytobenthos]] [[Category:Benthic invertebrates]] [[Category:Fish]]

Revision as of 08:51, 27 May 2014

Thur


Factsheet: Thur

General
Country CH
River Name Thur
Site Name Thur
River Characterisation
    River typology
    Location (Lat Lon) 47.5918, 8.77114000000006
    Altitude mid-altitude: 200 - 800 m
    Catchment area large: > 1000 - 10000 km2
    Geology Calcareous
    National code/
    River type name
    Hydromorphological quality elements

    Biological quality elements
    Ecosystem Services
    EU Directives
    Pressures
    Measures
    Other
    Project size 1.6 km
    Approximate costs > 1 000 000 Euros
    Synergy Flood protection, ecology, recreation
    Status Realised
    Period of realization 2000 - 2003
    Evaluation Hydromorphological and ecological changes
    Implemented by Amt für Umwelt (Thurgau) and Amt für Abfall, Wasser, Energie und Luft (Zurich)


    Key features of the case study

    Site description

    Measures selection

    Success criteria

    Ecological response

    Hydromorphological response

    Monitoring before and after implementation of the project

    Socio-economic aspects

    Contact person within the organization

    Extra background information

    References


    Related Measures

    Related Pressures

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