Water quality monitoring of the BRANTAS Estuary, Indonesia

In order to assess the water quality of the Brantas River and the adjacent coastal areas of Java, Indonesia, an automated monitoring station has been developed and assembled inside a container at the banks of the river. Time series over a year show the seasonal (dry/wet) variations with dramatic bad water quality during dry season. From the day-night variations some estimations about biogeochemical processes can be derived. In order to assess the distribution of freshwater and related conservative water constituents a hydrodynamic 3D-model has been applied. The results show a high influence of the coastal waters during wet season but only local influences in front of the rivers during dry season.