Quantitative Analysis Of Factors Affecting Seafloor Topography Changes

The change of seabed topography is affected by many factors,including seabed bottom quality,tidal currents,seawater sand content and sedimentation,coast and estuary dynamics,topography itself and other natural factors,as well as human activities.How to scientifically,objectively and quantitatively analyze the impact of these influencing factors on the seabed topography is a problem that has not been well resolved so far.This study is based on the large-scale seabed topography survey data of Phase III of Jiaozhou Bay,combined with G-statistics in spatial statistics and geodetector models,and analyzed the main natural factors that affect the changes in the seabed topography of Jiaozhou Bay.The purpose is to provide A quantitative analysis method for the influence factors of seabed topography changes.The main work of this paper includes:(1)A unified benchmark for the submarine water depth data of the three phases of Jiaozhou Bay in 1992,2003,and 2013 was established and DDM was established to compare the submarine water depths to obtain the changes in the submarine topography of the Jiaozhou Bay.(2)Use the cluster analysis function of G-statistic to perform cluster statistical analysis on the submarine topography changes in Jiaozhou Bay,obtain the aggregation characteristics of submarine topography changes,and studying the spatial law of seabed topography(3)Use Geodetector to detect the influence factors of the submarine topography changes in Jiaozhou Bay,determine the correlation between various influencing factors and submarine topography changes,and quantify the correlation,and obtain the quantitative results of the influence factors of the submarine topography changes.The conclusions of this article are as follows:(1)The submarine topography of Jiaozhou Bay changed in 1992,2003,and 2013.Most areas showed a downward trend of topography,manifested in a state of material reduction(scouring),and increased topography in some areas near the coast and at the mouth of the bay.Material increase(siltation)state.(2)G-statistic can be used for the cluster analysis of submarine topography changes.The clustering feature results of submarine topography changes reflect that topographic changes have a certain spatial distribution law and are obviously regional,which lays a foundation for further quantitative analysis of topographic changes influencing factors The basis of analysis.(3)The results of the Geodetector show that the flow direction and velocity of water,the depth of the seabed,the bottom quality of the seabed,and the slope and slope of the topography all have a certain impact on the change of the submarine topography of Jiaozhou Bay,and the impact of each factor on the topography is different.The impact of different types on the terrain is also different.When the factors interact,the impact on the terrain is greater.The geographic detector quantified the influence of each factor,and obtained the quantitative analysis result of the influence factor of the seabed topography change.