3-D scanning of River bed in identified bridges of N.F.Railway under Dy.CE/BR- Line/Maligaon.

A-NON SCHEDULE ITEM

3D Scanning/Mapping of River bed: The bathymetry survey of river bed around the bridge piers is to be done using modern acoustic depth-sounding instruments (ADCP) and RTK (Real Time Kinematic) GPS equipment mounted to a floating raft. The newest generation of acoustic Doppler current profilers have up to five acoustic beams acquiring spatially distributed samples of water depth including velocity column data, thus increasing the resolution and quality of the data without any increase man-hours in the field. After the field data acquisition process is complete, post- processing and integration of data is necessary in order to get physically relevant information. The integrated Bathymetry and velocity mapping system equipment and software shall be in good 1 condition and should be with latest technology. The equipment should measure the Bathymetry data along with velocity data so that the scour depth and the velocity near the piers can be measured. The integrated Bathymetry and velocity mapping system should have an integrated RTK GPS for navigation and should also use acoustic bottom track system at the same time. The process ADCP is to be also used for discharge measurement applications and cross-section measurement near the bridges. The instrument should be able to be powered with rechargeable battries and also through AC-DC power supply. The area to be covered shall be the river bed under the complete length of the bridge and 10 metres on either side of the bridge width. The following shall be the output received from the survey: (i) Depth points of the river bed. (ii) Velocity map of the river. (iii) Bathymetry map of the river bed. (iv) Change in the river beds. Upto 100 metres of bridge length Per

3D Scanning/Mapping of River bed: The bathymetry survey of river bed around the bridge piers is to be done using modern acoustic depth-sounding instruments (ADCP) and RTK (Real 2 Time Kinematic) GPS equipment mounted to a floating raft. The newest generation of acoustic Doppler current profilers have up to five acoustic beams acquiring spatially distributed samples of water depth including velocity column data, thus increasing the resolution and quality of the data without any increase man-hours in the field. After the field data acquisition process is complete, post- processing and integration of data is necessary in order to get physically relevant information. The integrated Bathymetry and velocity mapping system equipment and software shall be in good condition and should be with latest technology. The equipment should measure the Bathymetry data along with velocity data so that the scour depth and the velocity near the piers can be measured. The integrated Bathymetry and velocity mapping system should have an integrated RTK GPS for navigation and should also use acoustic bottom track system at the same time. The process ADCP is to be also used for discharge measurement applications and cross-section measurement near the bridges. The instrument should be able to be powered with rechargeable battries and also through AC-DC power supply. The area to be covered shall be the river bed under the complete length of the bridge and 10 metres on either side of the bridge width. The following shall be the output received from the survey: (i) Depth points of the river bed. (ii) Velocity map of the river. (iii) Bathymetry map of the river bed. (iv) Change in the river beds. Beyond 100 metres of Bridge length