Title

Experimental Study on the Erosion Stability of Coarse Grain Materials under Waves

DOI

10.6119/JMST-015-0610-12

Authors

Alexander Schendel;Nils Goseberg;Torsten Schlurmann

Key Words

scour protection ; hydraulic model test ; wide-graded grain material ; erosion stability

PublicationName

Journal of Marine Science and Technology

Volume or Term/Year and Month of Publication

23卷6期(2015 / 12 / 01)

Page #

937 - 942

Content Language

英文

English Abstract

Large-scale hydraulic model tests were carried out by the Leibniz University of Hannover, Germany to investigate the performance of wide-graded grain materials (0.1-200 mm) as scour protection system tested under spectral wave loads. The model tests were conducted in the Large Wave Flume (GWK) of the Forschungszentrum Küste (FZK) assuming a length scale of 1:4. The experimental setup consisted of a single layer material bed protecting a monopile (D=1 m) as often used as offshore supporting structure. In order to measure the structure-induced scour development around the monopile acoustic backscatter systems (ABS), single-beam echosounder, and a 3D laser scanner were used. Matching environmental conditions of the North Sea, the model tests were carried out with spectral wave load (JONSWAP-spectra) and successively increasing significant wave heights up to H_s=1.3 m. As result, a maximum scour depth of S/D=0.161 was found after 9000 waves which resembled a synthetic storm duration of 20 h. The results indicate high stability against spectral wave load and demonstrate the capability of wide-graded material to perform reasonably well under wave loads, particularly applied in a dynamic design of scour protection.

Topic Category 基礎與應用科學 > 海洋科學
工程學 > 市政與環境工程
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