11:45 AM - 12:00 PM
[MIS26-11] Estimation method of tephra deposition using photovoltaic power generation data for model validation of tephra fall simulation.
Keywords:Estimation of tephra fall, Photovoltaic power generation
The authors propose an application of photovoltaic (PV) power data to estimation of tephra fall. Kaldellis and Kapsali (2011) indicated liner relationship between tephra deposition amount and PV power efficiency. In generally, numerous PV systems have been installed in the Japan and its PV output data has been also monitored at several minute intervals. This approach makes it possible to obtain the tephra fall data in high resolution without new instruments.
We investigated a relationship between tephra deposition and PV module efficiency at Kirishima exposure site in Kyusyu region (on the western part of the Japan islands) in July 2013. In case of a volcanic eruption event of Mt. Sakura-jima (on the southern part of Kyusyu region), it was confirmed that PV power output was on the decrease. PV power output restituted after rainfall event in 18 July, (see Figure). The number of events that PV power output was decreased more than 20 % compared with an initial condition is 72 days in 2013.