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Advanced Taiwan Ocean Prediction System

Tseng, Tsu-Lun - ALL News | 2018-05-09 | Count:282


Title: Simulating the storm damage to forests in Earth System Models


Earth System Models are currently the most advanced tools to study the interactions between humans, their use of natural resources and the climate. Although storms are much more damaging than fire to European forests, storm induced disturbances are not yet explicitly dealt with in Earth System Models. The inclusion of storm damage in Earth System Models has for long been hampered by their big-leaf approach which cannot provide the canopy structure information that is required by process-based wind fall models. Recently the ORCHIDEE model replaced the big-leaf assumptions and replaced it by a 3D description of the canopy structure. This opportunity was used to incorporate the process descriptions included in the small-scale wind risk model, ForestGALES, into the large-scale land surface model ORCHIDEE. This new version of ORCHIDEE has been parameterized over Southern Sweden for Gudrun (2005). Subsequently, the model performance and its parameters have been validated against big storms in southern Sweden in the period 1900-2010 and European storms between 1950 and 2010 for which the damage was archived in the EFI storms database.

I will also talk about the first model application in Taiwan. The typhoon damages caused by the NESAT in 2017 have been estimated by the model. A land reconstruction with detail and fine spatial resolution has been carried out for the aforementioned numerical experiment setup. The spatial information of the critical wind speed distribution for different forest stands will be presented in my talk.

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