Rapid dune changes associated with overwash processes on the deltaic coast of South Louisiana
Rapid dune changes associated with overwash processes on the deltaic coast of South Louisiana
复制标题
南路易斯安那州三角洲海岸与过度冲刷过程相关的沙丘快速变化
DOI：
10.1016/0025-3227(88)90020-5
复制
发表时间：
1988
期刊：
影响因子：
2.9
通讯作者：
S. Penland
中科院分区：
文献类型：
--
作者：
W. Ritchie;S. Penland
路易斯安那州南部的卡米纳达-莫罗屏障岬角是一条低调的海滩和沙丘海岸线，正在迅速侵入废弃的拉福什三角洲复合体的表面。随着冷锋（每年 10-30 次）和飓风（每 4 年一次）的通过，全年都会发生过度冲刷事件，其频率、强度和地貌改变程度各不相同。这条海岸线由冲刷和沙丘表面组成，对冲刷冲击反应迅速。储存在冲刷沉积物中的细沙很容易通过风作用而被重新加工成海岸带的各种沙丘形式，这些沙丘形式很快就会被植被覆盖。地貌变化根据沙丘的位置、地面高程和表面稳定性而变化。独立因素包括淹没浪涌高度、海滩坡度和现有地貌的存在。十年来，以航空照片和录像调查为补充的详细调查记录了这些变化。对这些信息源的分析可以深入了解这一独特海岸线的总体演变，以及不同自然地理环境中沙丘、海滩和冲刷沉积物的地貌相互作用。
The Caminada-Moreau barrier headland of South Louisiana is a low-profile beach and dune coastline that is transgressing rapidly over the surfaces of the abandoned Lafourche delta complex. With the passage of cold fronts (10–30 times per year) and hurricanes (once every 4 yrs), overwash events occur year round with varying degrees of frequency, intensity and geomorphological modification. This coastline consists of washover and dune surfaces that respond rapidly to overwash impact. The fine sand stored in washover deposits is easily reworked by aeolian processes into a variety of dune forms in the shore-zone that are vegetated rapidly. Geomorphological changes vary according to the position, ground elevation, and surface stability of the dunes. Independent factors are overwash surge elevations, beach gradient and the presence of pre-existing landforms. For ten years detailed surveys supplemented by aerial photographs and videotape surveys have recorded these changes. The analysis of these information sources provides insight into both the general evolution of this distinctive coastline and also the geomorphological interaction of dunes, beaches and washover deposits in different physiographic settings.