Modelling climate‐change impacts on stream temperature of Formosan landlocked salmon habitat

Abstract

Abstract:A physics-based model is provided for predicting the impact of climate change on stream temperature and, in turn, on Formosan landlocked salmon (Oncorhynchus masou formosanus) habitat. Because upstream watersheds on Taiwan Island are surrounded with high and steep mountains, the influence of mountain shading on solar radiation and longwave radiation is taken into account by using a digital elevation model. Projections using CGCM2 and HADCM3 models and CCCM and GISS models provided information on future climatic conditions. The results indicate that annual average stream temperatures may rise by 0Ð5°C (HADCM3 short term) to 2Ð9°C (CGCM2 long term) due to climate change. The simulation results also indicate that the average suitable habitat for the Formosan landlocked salmon may decline by 333 m (HADCM3 short term) to 1633 m (CGCM2 long term) and 166 m (HADCM3 short term) to 1833 m (CGCM2 long term) depending on which thermal criterion (17°C and 18°C respectively) is applied. The results of this study draw attention to the tasks of Formosan landlocked salmon conservation agencies, not only with regard to restoration plans of the local environment, but also to the mitigation strategies to global climate change that are necessary and require further research.

Sensitivity of streamflow from a Himalayan catchment to plausible changes in land cover and climate

“…Variation in streamflow during a year and between years is primarily related to variations in rainfall, but the watershed as a whole provides a partial buffering of the rainfall signal. Van Noordwijk et al (2004a) proposed a simple buffer indicator calculated as the ratio of the sum of daily discharges above the average discharge and the sum of daily rainfall above the average rainfall. This can be done over a hydrological year, or part thereof.…”

“…The monthly temperature and precipitation for climate scenarios were determined by using equations recommended by Tung et al (2006) as follows. mT,Current ) and ( mP,Future ł mP,Current ) are the mean monthly change in temperature (T,°C) and precipitation (R P , %) for different scenarios compared to the baseline period , respectively.…”

“…Total water yield and regularity of flow need to be assessed in relation to annual rainfall and regularity of rainfall, respectively. A buffer indicator that divides aboveaverage daily river flow by above-average daily rainfall (both expressed in mm) can quantify the flow modification due to catchment condition (Van Noordwijk et al, 2004a).…”

Temporal variation of nitrate and phosphate transport in headwater catchments: the hydrological controls and land use alteration

“…1). The Gaoshan and Yikawan creeks are the only habitat for the formosan landlocked salmon (Oncorhynchus masou formosanus) (Tung et al, 2006;Lee et al, 2012). In this study, the high-frequency water sampling sites were installed.…”

Hydrologic and Water Quality Responses to Precipitation Extremes in Nakdong River Basin

“…국외에서는 기후변화로 인한 수온 상승이 수생태계 교 란과 수질에 미치는 영향을 평가하기 위해 수질모형의 적 용에 관한 연구들이 활발히 진행되고 있으며 (Michael et al, 2005;Tung et al, 2006), 기후변화 시나리오와 다양한 유역환경 변화 시나리오를 접목하여 수문학적 영향 및 수 질변화를 예측, 평가하는 연구들이 진행되고 있다 (Bouraoui et al, 2002;Varanou et al, 2002;Bouraoui et al, 2004;Nearing et al, 2005;Komatsu et al 2007). 국내 에서도 최근 5년 간 기상 및 수문 관측 자료의 평가와 기 후변화 시나리오 기반의 수문 및 수질 예측 등의 연구들 (정일원 등, 2008; 한수희 등, 2009; 박종윤 등, 2009; 최대 규 등, 2009; 유승환, 2009; 이정호 등, 2010 …”