Decadal variations in wave heights off Cape Kelba, Saaremaa Island, and their relationships with changes in wind climate

• Autorzy: Suursaar Ű. , Kullas T.
• Języki publikacji: EN

Abstrakty

EN

Based on wind data from the Vilsandi meteorological station and a 5-month calibration measurement with a bottom-mounted Recording Doppler Current Profiler (RDCP), a semi-empirical hindcast of wave parameters near the quickly developing accumulative Kelba Spit is presented for the period 1966-2006. The significant wave heights with a gross mean value of 0.56 m exhibited some quasiperiodic cycles, with the last high stage in 1980-95 and a decreasing overall trend of -0.001 m per year. At the same time, both the frequency and intensity of high wave events showed rising trends, and the mean wave heights during winter (December to February) increased as well. As the study area has the longest fetches in westerly directions, the discussed tendencies in wave conditions are sensitive to regional changes in the wind climate and can be related to a decrease in the local average wind speed on the one hand, but an intensification of westerly winds, storm events and the wintertime NAO index on the other. The roughest wave storms on record were associated with prominent W-storms on 2 November 1969 and 9 January 2005; a few other extreme wind events (e.g. in 1967, 1999, 2001), however, did not yield equally prominent waves.

Słowa kluczowe

EN

wave hindcast; wave measurements; winds; storms; climate change; RDCP; Baltic Sea

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2009
• Tom: No. 51 (1)
• Strony: 39--61
• Opis fizyczny: bibliogr. 41, tab., wykr.

Twórcy

autor

Suursaar Ű.

autor

Kullas T.

• Estonian Marine Institute, University of Tartu, Mäealuse 10a, EE-12618 Tallinn, Estonia,

Bibliografia

• Alexandersson H., Tomenvirta H., Schmith T., Iden K., 2000, Trends of storms in NW Europe derived from updated pressure data, Climate Res., 14 (1), 71-73.
• BACC, 2008, Assessment of climate change for the Baltic Sea basin, Springer-Verlag, Berlin-Heidelberg, 473 pp.
• Bauer E., 2001, Interannual changes of the ocean wave variability in the North Atlantic and in the North Sea, Climate Res., 18 (1-2), 63-69.
• Broman B., Hammarklint T., Rannat K., Soomere T., Valdmann A., 2006, Trends and extremes of wave fields in the northern part of the Baltic Proper, Oceanologia, 48 (S), 165-184.
• CERC - Coastal Engineering Research Center, U.S. Army, 1984, Shore protection manual, Vol. 1, 3rd edn., U.S. Govt. Printing Office, Washington, DC, 719 pp.
• Gaslikova L., Weisse R., 2006, Estimating near-shore wave statistics from regional hindcasts using downscaling techniques, Ocean Dynam., 56 (1), 26-35.
• Hasselmann K., 1962, On the nonlinear energy transfer in a gravity wave spectrum. Part 1: A method for efficient computations of the exact nonlinear transfer integral, J. Fluid Mech., 12, 481-500.
• Huttula T., 1994, Suspended sediment transport in Lake Säkylän Pyhäjärvi, Aqua Fennica, 24 (2), 171-185.
• Jaagus J., Post P., Tomingas O., 2008, Changes in storminess on the western coast of Estonia in relation to large-scale atmospheric circulation, Climate Res., 36 (1), 29-40.
• Jones P.D., Jónsson T., Wheeler D., 1997, Extension to the North Atlantic Oscillation using early instrumental pressure observations from Gibraltar and South-West Iceland, Int. J. Climatol., 17 (13), 1433-1450.
• Jönsson A., Broman B., Rahm L., 2002, Variations in the Baltic Sea wave fields, Ocean Eng., 30 (1), 107-126.
• Kahma K., Pettersson H., Tuomi L., 2003, Scatter diagram wave statistics from the northern Baltic Sea, Finn. Inst. Mar. Res. Rep., Ser. No. 49, 15-32.
• Keevallik S., Soomere T., Pärg R., Zhukova V., 2007, Outlook for wind measurements at Estonian automatic weather stations, Proc. Estonian Acad. Sci. Eng., 13 (3), 234-251.
• Komen G. J., Cavaleri L., Donelan M., Hasselmann K., Hasselmann S. Janssen P.A.E.M., 1994, Dynamics and modelling of ocean waves, Cambridge Univ. Press, New York, 554 pp.
• Luettich Jr. R.A., Harleman D.R. F., Somlyody L., 1990, Dynamic behaviour of suspended sediment concentration in a shallow lake perturbed by episodic wind events, Limnol. Oceanogr., 35 (5), 1050-1067.
• Massel S.R., 1996, Ocean surface waves: Their physics and prediction, World Sci., Singapore, 491 pp.
• Mietus M., 1998, The climate of the Baltic Sea Basin, marine meteorology and related oceanographic activities, World Meteorol. Org., Rep. No. 41, Geneva.
• Orviku K., Jaagus J., Kont A., Ratas U., Rivis R., 2003, Increasing activity of coastal processes associated with climate change in Estonia, J. Coast. Res., 19 (2), 364-375.
• Özger M., Sen Z., 2007, Triple diagram method for the prediction of wave height and period, Ocean Eng., 34 (7), 1060-1068.
• Rivis R., 2004, Changes in shoreline positions on the Harilaid Peninsula, West Estonia, during the 20th century, Proc. Estonian Acad. Sci. Biol. Ecol., 53 (3), 179-193.
• Samad M.A., Yanful E.K., 2005, A design approach for selecting the optimum water cover depth for subaqueous disposal of sulfide mine tailings, Can. Geotech. J., 42 (1), 207-228.
• Scientific-practical handbook of the climate of the U.S.S.R, 1990, Part 3, Gidrometeoizdat, Leningrad, (in Russian).
• Seinä A., 1994, Extent of ice-cover 1961-1990 and restrictions to navigation 1981-1990 along the Finnish coast, Finn. Mar. Res., 262, 3-34.
• Seymour R. J., 1977, Estimating wave generation in restricted fetches, J. Waterw. Port C. Div., 251-263.
• Siegismund F., Schrum C., 2001, Decadal changes in the wind forcing over the North Sea, Climate Res., 18 (1-2), 39-45.
• Soomere T., 2001a, Wave regimes and anomalies off north-western Saaremaa Island, Proc. Estonian Acad. Sci. Eng., 7 (2), 157-173.
• Soomere T., 2001b, Extreme wind speeds and spatially uniform wind events in the Baltic Proper, Proc. Estonian Acad. Sci. Eng., 7 (3), 195-211.
• Soomere T., 2008, Extremes and decadal variations of the northern Baltic Sea wave conditions, [in:] Extreme ocean waves, E. Pelinovsky & C. Kharif (eds.), Springer, 139-157.
• Soomere T., Behrens A., Tuomi L., Nielsen J.W., 2008, Wave conditions in the Baltic Proper and in the Gulf of Finland during windstorm Gudrun, Nat. Hazards Earth Sys., 8 (1), 37-46.
• Soomere T., Zaitseva I., 2007, Estimates of wave climate in the northern Baltic Proper derived from visual wave observations at Vilsandi, Proc. Estonian Acad. Sci. Eng., 13 (1), 48-64.
• Suursaar Ű., Jaagus J., Kont A., Rivis R., Tönisson H., 2008, Field observations on hydrodynamic and coastal geomorphic processes off Harilaid Peninsula (Baltic Sea) in winter and spring 2006-2007, Estuar. Coast. Shelf Sci., 80 (1), 31-41.
• Suursaar Ű., Jaagus J., Kullas T., 2006a, Past and future changes in sea level near the Estonian coast in relation to changes in wind climate, Boreal Environ. Res., 11 (2), 123-142.
• Suursaar Ű, Kullas T., 2006, Influence of wind climate changes on the mean sea level and current regime in the coastal waters of west Estonia, Baltic Sea, Oceanologia, 48 (3), 361-383.
• Suursaar Ű., Kullas T., Otsmann M., Saaremäe I., Kuik J., Merilain M., 2006b, Cyclone Gudrun in January 2005 and modelling its hydrodynamic consequences in the Estonian coastal waters, Boreal Environ. Res., 11 (2), 143-159.
• Suursaar Ű., Sooäär J., 2007, Decadal variations in mean and extreme sea level values along the Estonian coast of the Baltic Sea, Tellus A, 59 (2), 249-260.
• Tönisson H., Orviku K., Jaagus J., Suursaar Ű., Kont A., Rivis R., 2008, Coastal damages on Saaremaa Island, Estonia, caused by the extreme storm and flooding on January 9, 2005, J. Coast. Res., 24 (3), 602-614.
• USACE - U.S. Army Corps of Engineers, 2002, Coastal engineering manual, Rep. EM 1110-2-1100, U.S. Govt. Printing Office, Washington DC.
• Vikebø F., Furevik T., Furnes G., Kvamstø N.G., Reistad M., 2003, Wave height variations in the North Sea and on the Norwegian continental shelf, 1881-1999, Cont. Shelf Res., 23 (3-4), 251-263.
• WASA Group, 1998, Changing waves and storms in the Northeast Atlantic?, Bull.Am. Meteorol. Soc., 79, 741-760.
• Weisse R., Günther R., 2007, Wave climate and long-term changes for the Southern North Sea obtained from a high-resolution hindcast 1958-2002, Ocean Dynam., 57 (3), 161-172.
• Yan Z., Bate S, Chandler R.E., Isham V., Wheater H., 2006, Changes in extreme wind speeds in NW Europe simulated by generalized linear models, Theor. Appl.Climatol., 83 (1-4), 121-137.