Stream of colours feed the Gulf of Tonkin

Sentinel-2 MSI acquired on 20 December 2017 at 03:41:51 UTC
Sentinel-2 MSI acquired on 31 October 2018 at 03:28:49 UTC
Author(s): Sentinel Vision team, VisioTerra, France - svp@visioterra.fr
Keyword(s): Water colour, hydrology, sediment load, erosion, alluvium, river, channels, canals, irrigation, Vietnam, Gulf of Tonkin.
Fig. 1 - 20.12.2017 - 4,3,2 natural colour - Red River (brown) meets Black River (blue) & Lô River (cyan) resulting in an olive green stream.
Fig. 2 - Past the city of Mỵ Hoà, Bôi River quickly changes from blue to light blue, to yellowish to green and finally cyan.
Fig. 3 - Ma River (blue) meets its main tributary Chu River (green) across a landscape of croplands riddled with irrigation channels.
Fig. 4 - 31.10.2018 - The dark blue water of Cửa Đạt lake turns yellow when charged with sediments before it gets cyan at the river mouth.