TY - JOUR
T1 - THE SPIRAL WAVEMAKER FOR LITTORAL DRIFT STUDIES.
AU - DALRYMPLE, R. A.
AU - DEAN, R. G.
PY - 1972/1/1
Y1 - 1972/1/1
N2 - A TECHNIQUE FOR SIMULATING AN INFINITELY LONG BEACH IN THE LABORATORY IS INTRODUCED, WITH THE OBJECTIVE OF ELIMINATING END EFFECTS USUALLY PRESENT WITH SHORT STRAIGHT BEACH SECTIONS.THE TECHNIQUE INVOLVES THE SPIRAL WAVEMAKER GENERATING WAVES IN THE CENTRE OF A CIRCULAR BASIN.LTHE WAVEMAKER, CONSISTING OF A VERTICAL RIGHT-CIRCULAR CYLINDER OSCILLATING IN A SMALL CIRCLE ABOUT ITS AXIS, IS DESCRIBED IN DETAIL.THEORETICAL DEVELOPMENTS, USING SMALL-AMPLITUDE WAVE ASSUMPTIONS, SHOW THAT THE SURFACE WAVE CRESTS GENERATED BY THE WAVEMAKER MAY BE DESCRIBED, AT A PARTICULAR TIME, AS AN ARCHIMEDIAN-TYPE OF SPIRAL, WITH THE WAVEMAKER AT ITS ORIGIN.ALSO, THE CRESTS IMPINGE ON THE CIRCULAR BEACH EVERYWHERE AT THE SAME ANGLE OF INCIDENCE.LEXPERIMENTS WITH A PROTOTYPE SPIRAL WAVEMAKER VERIFY THE THEORY, WITH CLOSE RESULTS FOR SHALLOW WATER WAVES.LITTORAL DRIFT APPLICATIONS OF THE WAVEMAKER ARE GIVEN.(A)
AB - A TECHNIQUE FOR SIMULATING AN INFINITELY LONG BEACH IN THE LABORATORY IS INTRODUCED, WITH THE OBJECTIVE OF ELIMINATING END EFFECTS USUALLY PRESENT WITH SHORT STRAIGHT BEACH SECTIONS.THE TECHNIQUE INVOLVES THE SPIRAL WAVEMAKER GENERATING WAVES IN THE CENTRE OF A CIRCULAR BASIN.LTHE WAVEMAKER, CONSISTING OF A VERTICAL RIGHT-CIRCULAR CYLINDER OSCILLATING IN A SMALL CIRCLE ABOUT ITS AXIS, IS DESCRIBED IN DETAIL.THEORETICAL DEVELOPMENTS, USING SMALL-AMPLITUDE WAVE ASSUMPTIONS, SHOW THAT THE SURFACE WAVE CRESTS GENERATED BY THE WAVEMAKER MAY BE DESCRIBED, AT A PARTICULAR TIME, AS AN ARCHIMEDIAN-TYPE OF SPIRAL, WITH THE WAVEMAKER AT ITS ORIGIN.ALSO, THE CRESTS IMPINGE ON THE CIRCULAR BEACH EVERYWHERE AT THE SAME ANGLE OF INCIDENCE.LEXPERIMENTS WITH A PROTOTYPE SPIRAL WAVEMAKER VERIFY THE THEORY, WITH CLOSE RESULTS FOR SHALLOW WATER WAVES.LITTORAL DRIFT APPLICATIONS OF THE WAVEMAKER ARE GIVEN.(A)
UR - http://www.scopus.com/inward/record.url?scp=18244422499&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=18244422499&partnerID=8YFLogxK
U2 - 10.1061/9780872620490.040
DO - 10.1061/9780872620490.040
M3 - Article
AN - SCOPUS:18244422499
VL - 1
SP - 689
EP - 705
JO - PROC. 13TH COASTAL ENGNG. CONF. (VANCOUVER)
JF - PROC. 13TH COASTAL ENGNG. CONF. (VANCOUVER)
IS - (JULY 10-14, 1972)
ER -