COADAPT Coastal protection in future climate conditions
Introduction COADAPT KDI s work with COADAPT Conclusions and outlook Discussion COADAPT sand nourishments SIDE 2
The Danish Coastal Authority A division of The Danish Ministry of the Environment and Food is the official coastal government agency is an independent authority covering all of Denmark s 7,300 km of coastline, managing the governmental socio-economic interests within the field of coastal protection. regulatory tasks concerning coastal protection and the state territorial waters are carried out by means of analyses, project planning, construction, operation, and warning. Introduction SIDE 3
COADAPT Funded by the Danish Council for Strategic Research Partners: DHI, University of Copenhagen, KDI Develop technical and shoreline management tools to meet the additional threats that an increased sea level rise and changes in storm conditions impose on coastal areas.» Understanding of the impact of climate changes» Coastal protection techniques» New shoreline management practices Introduction SIDE 4
Background Climate changes Sealevel rise Introduction SIDE 5
Background Elevated water level and changes in storm severity bring threats such as the increased risk of flooding and coastline retreat (coastal erosion) Introduction SIDE 6
Background Sand nourishment SIDE 7
Background Sand nourishment SIDE 8
COADAPT SIDE 9
Krogen Krogen SIDE 10
Fællesaftalen Krogen SIDE 11
Krogen - data Krogen SIDE 12
Krogen - nourishment Krogen SIDE 13
Krogen challenges using surveys Krogen SIDE 14
Krogen nourishment volume 790 690 590 1000 m 3 490 390 290 190 90 Measured development Natural erosion Dean -10 04/2012 10/2012 05/2013 11/2013 06/2014 Krogen SIDE 15
Krogen dynamics of nourishment Krogen SIDE 16
Krogen dynamics of nourishment Krogen SIDE 17
Krogen dynamics of nourishment Krogen SIDE 18
Duneface: Krogen profile analysis advances 30 m due to the nourishment retreats every year after nourishment one can see the tendency of nature to straighten out artificial undulations Shoreline: moves outwards due to nourishment retreats in periods with rough weather advances again in mild weather Profile: most notable changes in 2014.01 and 2014.02 Krogen SIDE 19
COADAPT conclusions Theoretical models built for first-time nourishments cannot be used to predict the decay in sand volume on repeatedly nourished stretches. A nourishment goes through an initial adjustment phase. The lifetime of the nourishment is longer than it appears. Nourishments greatly benefit surrounding areas. Sand nourishment and hard coastal protection Sandbar nourishments Interaction between nourishments Conclusion SIDE 20
Krogen beach width Krogen SIDE 21
COADAPT challenges Need for increased measurement accuracy Natural perturbations complicate analysis Unevenly timed surveys Infrequent surveys Conclusion SIDE 22
COADAPT further work Understanding Tools Guidelines Standards Classifications Conclusion SIDE 23
Kysterne.kyst.dk (in Danish) 2222 SIDE 24
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