Yusuke Hiraga, So Kazama, Chaiwat Ekkawatpanit, Keitaro Yamada
Received 2019/11/08, Accepted 2020/02/03, Published 2020/03/24

Yusuke Hiraga¹⁾²⁾, So Kazama¹⁾, Chaiwat Ekkawatpanit³⁾, Keitaro Yamada¹⁾

1) Department of Civil Engineering, Tohoku University, Sendai, Japan
2) Department of Civil and Environmental Engineering, University of California Davis, Davis, CA, USA
3) Department of Civil Engineering, King Mongkut’s University of Technology Thonburi, Thailand

Nowadays, a deterioration of floodplain water quality in the Lower Mekong River Basin in Cambodia is expected because of urbanization/industrialization by landfilling. This study aimed to evaluate the impact of floodplain landfilling on basin water quality. Field observations of total phosphorus (TP), chemical oxygen demand and heavy metals were conducted in the Mekong River Basin in Cambodia and the Chao Phraya River Basin in Thailand. In the Mekong River Basin, TP was 2.05 mg/L in the floodplain where large-scale landfill was carried out using waste, with iron (Fe) at the factory site 6.54 mg/L. In comparison, in the Chao Phraya River Basin, TP and Fe concentrations were low. A degree of floodplain water quality management commensurate to the level of economic development was confirmed from water quality conservation efforts, among others, in Thailand.

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Copyright (c) 2020 The Author(s) CC-BY 4.0