Repair a river-network sediment transport calculation
An Earth-surface modeling workflow uses the supplied source snapshot to simulate bed-material pulses moving through a river network. The calculation completes, but the resulting downstream history and stored river state do not match the physical behavior described by the supplied material.
Run the public reproduction, study the complete Python source snapshot, and repair the implementation so that the transport calculation, stored material, and tracked sediment motion remain scientifically consistent. The repair must generalize to other river networks, hydraulic conditions, sediment records, and time steps. Do not special-case the supplied fixture or replace the scientific calculation with a fixed report.
Work only in this task directory. The evaluation environment is Linux and has no
network access. You may modify files under source/.
Use:
python reproduce.py
The command returns 1 for the reproduced finite scientific inconsistency, 0
after a successful repair, and 2 for a runner or environment failure.