Use adaptive weighting factor

[lrntct]

See:

Sridharan, B., Gurivindapalli, D., Kuiry, S. N., Mali, V. K., Devi, N. N., Bates, P. D., & Sen, D. (2020).
Explicit Expression of Weighting Factor for Improved Estimation of Numerical Flu in Local‐inertial Models.
Water Resources Research. https://doi.org/10.1029/2020wr027357