Dodokal/GWS-Ethiopia-Precipitation-Memory

# Multi-Year Precipitation Memory of Groundwater Storage in Ethiopia (2003–2023) ## Overview Analysis code and data processing pipeline for characterizing the multi-year precipitation–groundwater storage relationship across Ethiopia's major hydrogeological zones using GRACE/GRACE-FO, CHIRPS, machine learning interpretability, wavelet coherence, and Dynamic Time Warping. ## Key Findings - Cumulative multi-year precipitation explains **72%** of GWS variance (vs Basement (0.79) > Volcanic (0.71) > Sedimentary (0.53) ## Scripts ### Run Order ``` 1. GEE_GWS_Retrieval_Ethiopia.js → Google Earth Engine (data export) 2. GEE_Spatial_Indices.js → Google Earth Engine (index rasters) 3. R_GWS_Analysis_Ethiopia.R → Main analysis (R) 4. R_Hydrogeological_Zonation.R → Aquifer-specific analysis (R) 5. R_Wavelet_Analysis.R → Wavelet coherence (R) 6. R_Spatial_Indices.R → Spatial index rasters (R) 7. R_Export_Organize.R → Organize outputs (R) ``` ### R Dependencies ```r install.packages(c("tidyverse", "data.table", "lubridate", "zoo", "terra", "sf", "ranger", "xgboost", "caret", "shapviz", "pdp", "vip", "dtw", "WaveletComp", "patchwork", "viridis", "scales", "cowplot", "ggcorrplot", "Metrics", "trend")) ``` ### Data Sources | Dataset | Source | Resolution | Period | |---------|--------|-----------|--------| | GRACE/GRACE-FO | JPL Mascon RL06.3v04 | ~25 km | 2002–2023 | | GLDAS Noah v2.1 | NASA | 0.25° | 2002–2023 | | CHIRPS v2.0 | CHG | 0.05° | 2003–2023 | | Hydrogeology | Ethiopia MoWE | Vector | Static | ## Author Kalid Hassen Yasin