Towards a non-intrusive method employing digital twin models for the assessment of complex large wood accumulations in fluvial environments

• DOI: 10.1016/j.jhydrol.2022.128505
• Publication Date: 2022-10-05T05:49:24Z
• Authors: Gabriel Spreitzer; Isabella Schalko; Robert M. Boes; Volker Weitbrecht
• Keywords: Ranging

Quantification and assessment of large wood (LW) accumulations in fluvial systems is still considered difficult due to the complex nature wooden deposits. Although knowledge about volumetric measures porosity parameters LW crucial for prediction hydraulic geomorphic effects, it has not yet been possible obtain accurate measurements. These limitations are mainly based on a lack applicable sensing technologies available past. In present study, close-range aerial surveying technique (Structure from Motion (SfM) photogrammetry) applied generating 3D replicates (digital twin models) deposits, enabling their assessment. addition, manually conducted measurements corresponding prototype help improve calibrate SfM-derived estimates. For first time, precise accumulations, ranging 52.5 83.2%, provided. novel parameter – packing arrangement used, which describes structural alignment individual elements accumulation benefits estimates 2.5D photogrammetric approach. Accordingly, randomly loosely organised allow high penetration depth approach, resulting more estimate actual porosity, as approaches solid volume accumulation. An empirical approach developed future approximation without need knowing volume. With work significant improvement our understanding employing non-intrusive provided, linked with field accumulations. Our study contributes an improved data acquisition processing plan, represents further important step towards systematic framework that urgently needed by river managers engineers better evaluate manage systems.