【摘要】 随着"海上苏东"的建设,滩涂围垦与港口建设迅速展开,吕四港是辐射沙脊群港口群之一,具有较大发展潜力,了解其所在的小庙洪潮汐水道的变化情况对吕四港建设有重要意义。用遥感中轴线方法对小庙洪水道进行演变分析,通过7景不同时期的遥感影像获取小庙洪中轴线,获得该水道1979～2009年间的演变情况。研究结果表明:1)通过对中轴线与同年地形数据叠加分析,发现中轴线的走势与潮汐水道深槽走势相似,可以用来代表潮汐水道的走势情况,用遥感中轴线法对不同时期的潮汐水道进行分析,可较快、较准确地揭示潮汐水道的动态演变;2)中轴线与潮汐水道深泓线有一定的偏移,造成偏移的原因是潮汐水道两岸坡度不一,坡度相差越大,偏移范围就越大;3)小庙洪水道的起始端处于淤长状态,分支逐渐减少,南部水动力较强,出现新的分支,整个小庙洪水道比较稳定。更多还原

【Abstract】 With the rapid development of tidal flat reclamation and the construction of the port in the project of "Developing the East Coast of Jiangsu",the Xiaomiaohong creek nearby Lvsi port located at radial sand ridges sea area was selected as a typical area for understanding its topographic and morphological evolution,which is conductive to the construction of the port.By using the Remote Sensing Axis Line method(RSAL),the axis lines of Xiaomiaohong creek were extracted based on one MSS image and six TM images in the period of 1979,1987,1989,1993,1995,2003 and 2009.The results showed that:(1) on the basis of overlaying generated axis line and DEM(digital elevation model) data both acquired in 2003,the axis line could be the substitution of the thalweg line because of the similar trend and minor deviation of the above two kinds of lines,which revealed that RSAL was serviceable and effective to understand the dynamic evolution of tidal creeks quickly and accurately;(2) deviation between axis line and thalweg line is inevitable because the slopes of both sides are asymmetric.The biased distance depended on the slope degree of creeks.The much larger the slope degree was,the further the distance was shifted;(3) from 1979 to 2009,the front end of Xiaomiaohong creek were growing and its subordinate branches were eroding.Some new subordinate branches were turned out and developed in southern part due to the strong hydrodynamic condition.Based on the comparison,the entire tidal creek was relatively stable.更多还原