Geologic profile charting by integrating sub-bottom profile and bathymetric data
Qian Wan-min · 2009
It's very important for hydrograph surveying synchronously with sub-bottom exploring for ocean geological investigation.When charting the final geological profile there are some troublesome problems to be solved.First,the actual navigation's track is departure from designed lines when spot surveying,and the sub-bottom profile's different interpretation method make the different interpreted result's precision;Second,when time-depth conversion we must conside the different stratums' velocity because of the sonic different propagating velocity in different stratums,while existing commercial softs treat this problem with one velocity;Third,when charting the geological profile,we must integrate the hydrograph's data with the stratums' thicknesses coming from sub-bottom profile.Based on the actual investigated data,the author analyses above problem's producing reason,and take valid methods to solve these problems.To solve the first problem,author use the ideal commercial soft to make fastly the hydrograph profile and bathymetric data along the planned surveying line,while developed myself a independent soft to interactive interpreting the sub-bottom profile,this soft offers event mark location picking and picking randomly each ping and line picking and auto picking etc.To solve the second problem,author offers a soft interface to define different stratum's velocity and the soft computes the interpreted stratum's thickness to seabed reflecting layer and depth using defining velocity,at last,the soft outputs each stratum's thickness and depth data according to user's defining filename.The third problem can be solved with integrating the output stratum's thickness with bathymetric data,but before integrating the two data,the picked sub-bottom's track position must be projected to survey planned line,otherwise,there is position error between picked sub-bottom's track position and hydrograph profile's position.With all of the above methods,we interpretes fastly the sub-bottom profile and produce the hydrography profile,at last we build the geological profile with the two data.All the interpreted data and geological profile are submitted to the clients,and we are approved by the clients for all of these efficient methods.