The High Water Line as Shoreline Indicator
The High Water Line as Shoreline Indicator
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发表时间：
2002-04
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通讯作者：
M. Pajak;S. Leatherman
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作者：
M. Pajak;S. Leatherman
海滩侵蚀率通常是通过地图和航空照片以及最近的全球定位系统来划定历史海岸线位置来确定的。出于制图目的，通常选择高水位线作为海岸线指示器;它被定义为潮湿的泰德边界，并通过“上次高潮在海滩上留下的标记”来定义。“通过实地测定或摄影测量手段获得的高水位线被假定为代表该年的平均海岸线位置，但实地研究表明，由于波浪、风、潮汐和其他因素引起的水位变化，高水位线的位置是可变的。本研究通过现场观测和录像资料的解释，调查了高潮线位置在潮汐周期、天数和月份内的短期变化。在马里兰州阿萨提格岛国家海滨和北卡罗来纳州达克的实地研究设施进行的研究表明，高潮线在一定限度内是一个有用的海岸线指标。在海岸侵蚀绘图和管理方面，全球定位系统根据实地高水位线的实际确定获得的海岸线被认为比照片判读的海岸线更准确。
Beach erosion rates are often determined by delineating historical shoreline positions from maps and aerial photographs and more recently global positioning systems (GPS). The high water line is usually selected as the shoreline indicator for mapping purposes; it is defined as the wet ted bound and by "markings left on the beach by the last high tide." The high water line that is acquired from field determination or photogrammetric means is assumed to represent the mean shoreline position for that year, but field studies have shown that its position is variable because of changes in water level due to waves, wind, tides, and other factors. This study investigated the short-term variability in the high water line location over tidal cycles, days, and months through field observations and interpretation of videotape data. Studies, undertaken at Assateague Island National Seashore in Maryland and at the Field Research Facility at Duck, North Carolina, indicated that the high water line is a useful shoreline indicator within certain limits. GPS acquired shorelines based on actual identification of the high water line in the field are deemed more accurate than photo-interpreted shorelines for coastal erosion mapping and management.