Morphological evolution and time-varying bedrock control of main channel at a mixed energy tidal inlet: Maumusson Inlet, France

被引:41
作者
Bertin, X
Chaumillon, E
Weber, N
Tesson, M
机构
[1] Univ La Rochelle, Ctr Littoral Geophys, F-17042 La Rochelle 1, France
[2] EPSHOM, F-29603 Brest, France
[3] Univ Perpignan, F-66860 Perpignan, France
关键词
tidal inlet; bathymetry; seismic VHR; bedrock morphology;
D O I
10.1016/S0025-3227(03)00353-0
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Maumusson Inlet, located on the French Atlantic coast, connects the Atlantic Ocean with the Marennes-Oleron tidal bay. The tidal range (2-6 m) and wave climate (mean height 1.5 m) place this tidal inlet in the mixed energy, tide dominant, category of Hayes [(1979) Barrier island morphology. In: Leatherman, S.P. (Ed.), Barrier Island, Academic Press, New York, pp. 1-28]. An innovative method, combining high quality bathymetric data (nine accurate Digital Elevation Models since 1824) with a very high seismic resolution, demonstrates a major tidal inlet evolution from 1824 onwards and its dramatic acceleration since 1970. The chronology of those morphological changes suggests strong coupling between the location of the tidal channel and the behaviour of the adjacent shorelines. The recent shoaling and migration of the inlet channel can be attributed to a decrease in tidal prism due to the filling in sediment of Marennes-Oleron Bay. Seismic data give evidence that the inlet was located on a major incision of the bedrock. It can be inferred that the bedrock exerts control of channel location, this control varying in time as a function of channel depth. A conceptual model is proposed, including the inlet, its adjacent shorelines, the tidal bay and the time-varying bedrock control of main channel location. Such a model could be considered valid in similar cases along other coastlines, i.e. coastlines with a fine unconsolidated sediment sheet. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:187 / 202
页数:16
相关论文
共 44 条
  • [1] Ashley G.M., 1994, SEPM SPECIAL PUBLICA, V51, P285, DOI DOI 10.2110/PEC.94.12.0285
  • [2] BALOUIN Y, 2001, THESIS U BORDEAUX 1
  • [3] BAXERRES P, 1978, THESIS U BORDEAUX 1
  • [4] Temporal evolution and internal architecture of an estuary-type sand ridge:: The Longe de Boyard along the French Atlantic Coast
    Chaumillon, É
    Gillet, H
    Weber, N
    Tesson, M
    [J]. COMPTES RENDUS GEOSCIENCE, 2002, 334 (02) : 119 - 126
  • [5] DEAN RG, 1993, J COASTAL RES, V18, P91
  • [6] FitzGerald D.M., 1988, LECT NOTES COASTAL E, P186, DOI [10.1029/LN029p0186, DOI 10.1029/LN029P0186]
  • [7] FitzGerald D.M., 1982, P 18 COAST ENG C ASC, P1094, DOI DOI 10.9753/ICCE.V18
  • [8] New England tidal inlets with special reference to riverine-associated inlet systems
    FitzGerald, DM
    Buynevich, IV
    Davis, RA
    Fenster, MS
    [J]. GEOMORPHOLOGY, 2002, 48 (1-3) : 179 - 208
  • [9] FITZGERALD DM, 1984, J SEDIMENT PETROL, V48, P227
  • [10] FitzGerald DM, 1996, J COASTAL RES, V23, P47