The evolution of embryonic creek systems in a recently inundated large open coast managed realignment site  

作　　者：Jonathan Dale Heidi M.Burgess Niall G.Burnside Paul Kilkie David J.Nash Andrew B.Cundy 

机构地区：[1]Centre for Aquatic Environments,School of Environment and Technology,University of Brighton,Brighton BN24GJ,UK [2]School of Geography,Archaeology and Environmental Studies,University of the Witwatersrand,Private Bag 3,Wits 2050,South Africa [3]National Oceanography Centre(Southampton),School of Ocean and Earth Science,University of Southampton,Southampton SO143ZH,UK

出　　处：《Anthropocene Coasts》2018年第1期16-33,共18页人新世海岸(英文)

摘　　要：Managed realignment(MR)schemes are being implemented to compensate for the degradation of coastal habitats.However,evidence suggests that MR sites have lower biodiversity than anticipated,which has been linked to poor drainage.Despite creek networks playing an important role in enhancing site drainage in natural intertidal environments,there remains a shortage of data on the formation and evolution of creeks within MR sites.This study evaluates creek development at the Medmerry Managed Realignment Site,UK.Creek development is investigated using differential global positioning system(dGPS)data,supported by sedimentological analyses and a high-resolution digital surface model(DSM)derived from images taken using a small unmanned aerial vehicle.Measurements indicated that creeks will develop relatively quickly,but are influenced by differences in the sub-surface sedimentological conditions.A suitable level of agreement was found between the DSM and dGPS measurements,demonstrating the appropriateness of this method to study creek development within intertidal environments at a higher resolution than traditional surveying techniques.These results are used to propose the collapse of sub-surface piping as the primary creek formation mechanism.Findings are discussed in terms of increasing the success of MR schemes and enhancing site design to maximise the ecosystem services provided.

关 键 词：managed realignment creeks PIPING small-unmanned aircraft system(sUAS) structure-from-motion(SfM) 

分 类 号：O41[理学—理论物理]