Data-Driven Method for Groundwater-Level Mapping and Monitoring-Well Network Optimization at Hanford

This report summarizes the initial results and outcomes of a physics-informed, data-driven groundwater level (GWL) mapping capability for the Hanford Site. GWL mapping at Hanford is typically conducted annually and requires a significant amount of computational and expert resources, and it does not allow assessment of the informational value of specific monitoring wells. The proposed method produces spatially and temporally resolved fields consistent with sparse, irregularly sampled, and nonuniformly distributed well measurements. Implemented successfully, this capability will allow rapid mapping of groundwater levels and provide an opportunity to optimize monitoring activities (both location and sampling frequency) based on data information value evaluation. The approach integrates a diffusion-based generative model – trained on MODFLOW simulation data from the Plateau-to-River (P2R) model – with score-based data assimilation (SDA), allowing observation-conditioned mapping without retraining for each monitoring-network layout.. Authors: Song, Xuehang [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)]; Chen, Tse-Chun [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)] (ORCID:0000000163005659); Kondyukov, Grigoriy [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)]; Hou, Zhangshuan [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)] (ORCID:0000000293886060); Demirkanli, Deniz I. [Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)]. DOE Contract: AC05-76RL01830. Subjects: 54 ENVIRONMENTAL SCIENCES