[A-HW18] Material transportation and cycling at the land-sea interface: from headwaters to the ocean

[AHW18-10] Anthropogenic impacts on water resources and nutrient flux in Asian coastal megacities

*Shin-ichi Onodera¹, Mitsuyo Saito¹, Anna Fadliah Rusydi², Jianyao Chen³, Iwan Ridwansyah² (1.Graduate School of Advanced Science and Engineering, Hiroshima University, 2.BRIN, 3.San Yat Sen University)

Keywords:Asian coastal megacities, Water resources, Nutrient fluxes

In Asian megacities, human activities (e.g. urbanization, agriculture, aquaculture etc.) cause degradation of water resources and increase the loads of nutrients and sediments in the coastal area. It is a big challenge to establish the framework of quality management (QM) for water resources (WR) and nutrient flux (NF) in the developing Asian megacities (AMCs) for sustainable water use and ecosystem conservation. To achieve the goal, the purpose of this research is quantifying the WR and NF for appropriate QM in coastal AMCs with different urbanization stages (USs) which consists four specific objects as follows: 1) Assessment of current WR and NF statuses considering vulnerability and resilience to water pollution, 2) Reconstruction of NF history, 3) Future scenario of WR and NF under climate extreme and human impacts, and 4) Framework of QM for WR and NF.

Acknowledgement
This work was supported by APN Project (CRRP2019-09MY-Onodera, PI: Shin-ichi Onodera) and JSPS Project (21KK0192, PI: Shin-ichi Onodera).