[A-HW36] Material transport, biodiversity and environmental changes in watersheds from headwaters to coasts

[AHW36-P18] Comparison of the denitrification zone and nitrate distribution at the catchment scale over two decades

*Kelly Tiku Tarh¹, Shin-ichi Onodera¹, Mitsuyo Saito¹, Miho Awamura², David Nyamweya Moenga¹, Takuya Ishida¹, Keisuke Koba³, Vinicius Rogel Paulino de Oliveira Oliveira⁴ (1. Hiroshima University, Graduate School of Advanced Science and Engineering, 2. Hiroshima University, School of Integrated Arts and Science, 3. Kyoto University, Center for Ecological Research (CER), 4. Sao Paulo University)

Keywords:Nitrate contamination, Denitrification, Nitrate isotopes, Coastal area, Agricultural groundwater, Spatial variability