The Climate Change Impact Assessment and The Establishment of Seasonal Early Warning System for The Habitat of Formosan Landlocked Salmon
Date Issued
2011
Date
2011
Author(s)
Perng, Po-Wen
Abstract
Formosan Landlocked Salmon (the scientific name Oncorhynchus masou formosanus) is an important specie of Taiwan. And more important, it is also the natural assets of the world. The ChiChaWan Creek is an important habitat of Formosa Landlocked Salmon. Yet, the range of habitat has been reducing gradually by the impact of human activities. Stream discharge and stream temperature are essential factors for Formosa Landlocked Salmon. Climate change may alter stream temperature and stream flows and then further affect the habitat of salmon which makes us to evaluate the possible change of stream flows and stream temperature in the catchment area.
According to the literature, stream temperature of seven continuous days is important. Therefore, this study works on the model’s improvement on the capability of continuous simulation first. Through continuous monitoring of stream temperature records and calculated with the model, improves stream temperature model, developed by the past. Adding the effect of cloud cover and surface runoff, the stream temperature model breaks through the limitation of weather conditions. The results show this model could reasonably simulate stream temperature continuously. And it will be an effective assessment tool for salmon habitat.
In order to analyze the impact on the salmon habitat under climate change, the study choose four GCMs, including INM-CM3, MRI-CGCM2_3_2, NCAR-CCSM3 and UKMO-HADCM3 and three SRES scenarios, including A2, A1B and B1. To reduce the risk of the failure of reintroduction, anticipatory assessments of choosing the appropriate section of river for reintroduction become essential. To exhibit the seasonal early warning system for the Formosan Landlocked salmon, this study takes ChiChaWan Creek as an example and focuses on the hydrological and thermal characteristics of the river. The early warning system can provide stream flows and stream temperature information in advance. This study further illustrates the risk of stream discharge and stream temperature of the river on the map. Besides, the messages can be updated instantly; hence, the authority can choose the most appropriate rivers section before reintroduction. In the future, early warning systems can be extended to all the upstream tributaries of DaJia Creek.
Subjects
Formosa Landlocked Salmon
stream flows
stream temperature
climate change
seasonal forecast
SDGs
Type
thesis
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