🎥 Exclusive: Drone Topo Survey & River Morphology Analysis by Engineer Rokib Hossain
Figure 2.1: Exclusive Drone Topography and Bathymetric Data Integration for Morphological Study of the Jamuna Riverbed.

Advanced River Morphology: Drone Topo Survey of Jamuna River

As a Hydrographic and Marine Engineering professional, monitoring the riverbed changes of the Jamuna River is critical for the stability of the Bangabandhu Bridge. This video captures our latest Drone Topo Survey, analyzing morphological shifts and scouring patterns.

📐 Engineering Math: Scour Depth Analysis

To ensure pier stability, we calculate the Maximum Scour Depth (ds) using river discharge data:

ds = 2.0 × y0 × (b / y0)0.4 × Fr0.33

Where:

  • y0: Approach flow depth.
  • b: Pier width.
  • Fr: Froude Number (Flow Velocity / Gravity).
By integrating drone data with bathymetric surveys, we maintain a Safety Factor of 2.0 for river training works.

Topo Survey & Morphology FAQ

1. What is a Drone Topo Survey? High-precision mapping of terrain using UAVs and photogrammetry.

2. How does it help in River Training? It detects changes in guide bunds and bank erosion early.

3. What is Bathymetry? The study of underwater depth and lake/ocean floors.

4. Why is Scour Depth important? Excessive scouring can undermine bridge piers, leading to failure.

5. Can drones map underwater? No, they map the surface; we sync it with Echo Sounder data for full profiles.

6. What is River Morphology? The study of river shapes and how they change over time.

7. How accurate are drone surveys? With GCPs (Ground Control Points), we achieve sub-centimeter accuracy.

8. Is Jamuna River difficult to survey? Yes, due to its high velocity and braiding nature.

9. What software is used? We use Pix4D or Agisoft for point cloud generation.

10. How often should surveys be done? Pre-monsoon and post-monsoon for reliable monitoring.

Engineer Rokib Hossain | River Engineering Solutions

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