Short-term intertidal bar mobility on a ridge-and-runnel beach, Merlimont, northern France

被引:48
|
作者
Anthony, EJ
Levoy, F
Monfort, O
Degryse-Kulkarni, C
机构
[1] Univ Littoral Cote dOpale, Coastal Geomorphol & Shoreline Management Unit, EA 3599, F-59140 Dunkerque, France
[2] Univ Caen, CNRS, UMR 6143, F-14000 Caen, France
关键词
ridge-and-runnel beach; intertidal bars and troughs; beach morphodynamics; longshore currents;
D O I
10.1002/esp.1129
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Digital elevation models and topographic profiles of a beach with intertidal bar and trough (ridge-and-runnel) morphology in Merlimont, northern France, were analysed in order to assess patterns of cross-shore and longshore intertidal bar mobility. The beach exhibited a pronounced dual bar-trough system that showed cross-shore stationarity. The bars and troughs were, however, characterized by significant longshore advection of sand under the influence of suspension by waves and transport by strong tide- and wind-driven longshore currents. Profile changes were due in part to the longshore migration of medium-sized bedforms. The potential for cross-shore bar migration appears to be mitigated by the large size of the two bars relative to incident wave energy, which is modulated by high vertical tidal excursion rates on this beach due to the large tidal range (mean spring tidal range = 8(.)3 m). Cross-shore bar migration is also probably hindered by the well-entrenched troughs which are maintained by channelled high-energy intertidal flows generated by swash bores and by tidal discharge and drainage. The longshore migration of intertidal bars affecting Merlimont beach is embedded in a regional coastal sand transport pathway involving tidal and wind-forced northward residual flows affecting the rectilinear northern French coast in the eastern English Channel. Copyright (C) 2004 John Wiley Sons, Ltd.
引用
收藏
页码:81 / 93
页数:13
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