海洋地质与第四纪地质2023，Vol.43Issue(6)：45-54,10.DOI:10.16562/j.cnki.0256-1492.2023080301
基于无人机SfM摄影测量的潮间带牡蛎礁地貌调查
Geomorphological survey of intertidal oyster reefs based on UAV Structure-from-Motion photogrammetry
摘要
Abstract
Oyster reefs is an important coastal morphological system,the spatial distribution pattern of the reefs profoundly influences the surrounding hydrodynamic and sedimentary processes,which in turn affects the evolution of oyster reefs.The Liyashan oyster reef in Haimen,Jiangsu,is an important and rare ecosystem in the Chinese coast;however,it has been seriously degraded by sediment cover and human fishing in recent years.A geomorphological observation of the oyster reefs in Liyashan was carried out using an unmanned aerial vehicle(UAV).Based on the SfM(Structure from Motion)photogrammetry,high-resolution three-dimensional models of the aerial photography region were reconstructed,including orthophoto and digital elevation model(DEM).Then,the visual interpretation and profile analysis on the reconstructed models were conducted.Results show that the oyster reefs are mainly composed of three types in distribution shape:string,patch,and ring.The"string"oyster reef ridges are generally oriented north-south,likely were formed by the degradation of"ring"reefs or self-organization process of oysters.The elevation differences within the surveyed area could reach more than 5 m,the highest elevation was 0.5 m(1985 national elevation),while the lowest elevation was-4.7 m.The reefs are still in a degraded state,and the evolutionary process is mainly as follows:potholes appear on the surfaces of the reefs → further expansion and extension of potholes → formation of grooves→ segmentation and disintegration of the reefs,accompanied by sedimentary burial of the reefs.This study shows that the UAV SfM technique can efficiently obtain geomorphological data of oyster reefs,which provides a strong support for studying the evolution of oyster reefs.关键词
运动恢复结构/牡蛎礁/地貌观测/空间分布/礁体演化Key words
Structure from Motion(SfM)/oyster reef/geomorphological observation/spatial distribution/reef evolution分类
海洋科学引用本文复制引用
庄佳铨,罗科,彭雲,樊一阳,林杭杰,王韫玮,于谦..基于无人机SfM摄影测量的潮间带牡蛎礁地貌调查[J].海洋地质与第四纪地质,2023,43(6):45-54,10.基金项目
国家自然科学基金"牡蛎礁多尺度沉积动力过程与地貌演化"(42076172) （42076172）
2021江苏省自然资源发展专项资金(海洋科技创新)项目(JSZRHYKJ202115) （海洋科技创新）
