TY - RPRT TI - Preserving nonlinear constraints in variational flow filtering data assimilation AU - Subrahmanya, Amit N. [Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)] (ORCID:0000000257696278) AU - Popov, Andrey A. [Univ. of Hawaii at Manoa, Honolulu, HI (United States)] AU - Gomillion, Reid J. [Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)] AU - Sandu, Adrian [Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)] PY - 2025 DO - 10.1007/s10596-025-10378-2 UR - https://www.osti.gov/biblio/3028298 ID - 3028298 ER -