Force-based Lagrangian Object Transport (FLOTR)_v2.0

FLOTR v2.0 is a Python-based, physics-based Lagrangian modeling framework developed to simulate macroplastic transport in rainfall-driven overland flow. The model couples time-varying hydrodynamic outputs, including water depth and depth-averaged velocity, with particle-scale force calculations to represent macroplastic release, mobilization, transport, and stopping under wetting and drying conditions. It accounts for object-specific properties such as mass, volume, projected area, controlling dimension, and orientation.

Version 2.0 extends FLOTR to represent interactions between transported macroplastics and urban storm-drain inlets. Capture and blockage are evaluated based on local water depth, inlet opening geometry, and object dimensions. The model also interpolates hydrodynamic conditions between available raster snapshots and records particle trajectories, inlet interactions, and final transport states.

This archive contains the FLOTR v2.0 Python source code, software requirements, citation metadata, and instructions for configuring and running the model. Application-specific hydrodynamic rasters, digital elevation data, and inlet inventories are not included and must be supplied by the user.