Estuarine and Coastal Environment, Coastal Engineering, Coastal Management, Sustainability Science

Welcome to Sasaki’s Laboratory!

Welcome to Sasaki’s Laboratory working on estuarine and coastal environmental studies. See also this site.


Severe salinity contamination in drinking water and associated human health hazards increase migration risk in the southwestern coastal part of Bangladesh

Bangladesh is a deltaic country and it is highly vulnerable to climate change and sea level rise. The southwestern part of this country is repeatedly devastated by cyclonic storm surges which create long-term waterlogging, flooding’s, and salinity problems. After the cyclone Sidr in 2007 and Aila in 2009, salinity problems in groundwater have significantly increased where groundwater is a principal source of drinking water in the coastal community. After the continuing consequences of salinity contamination and consumption of those types of water, local peoples are suffering from several types of health diseases. Average household health expenditure is significantly increased and it exerts more pressure on their vulnerable household economy. Thus, …

Time series plotting using hvPlot

hvPlot, a component of PyViz ia a new interactive plotting tool, which is a wrapper of Bokeh. hvPlot is easy to customize plotting options. However, currently there are some drawbacks, such as difficulty in adjusting aspect ratio of graph area, which may be resolved in Bokeh 1.1, slow processing, and cumbersome in exporting high resolution PNG file, comparing to Matplotlib. Default time series plotting Suppose df is a pandas DataFrame having a time series index and columns of ‘kion’ and ‘sped’, which are actually a dataset of air temperature and wind speed at Chiba Observatory, Japan, provided by Japan Meteorological Agency. import hvplot.pandas df[[‘kion’,’sped’]].hvplot() Customized plotting Now one column of …

2019.2.19-24 Field survey on coastal zone management in Marawila, Sri Lanka

Field survey on coastal erosion and its local perception in Marawila Coast, Sri Lanka, was performed collaborating with University of East London, Yokohama National University, and CC&CRMD (Coast Conservation and Coastal Resource Management Department, Sri Lanka). We got interviewed for National Television (Rupawahini), Sri Lanka, which was broadcast nationwide in the evening on February 23. We also interviewed the head of Negombo Fishing Union on their perception of the coastal management.