Author(s): Tsuyoshi Kinouchi; Hiroshi Yagi; Mamoru Miyamoto
Linked Author(s):
Keywords: Stream temperature; Urbanization; Anthropogenic heat input; Thermal impact
Abstract: To reveal long-term temperature change in urban streams associated with environmental changes such as urbanization and climate change, more than two decades of stream temperature data, urban effluent temperature and air temperature data are analyzed in conjunction with the urbanization in the central Tokyo area and its suburbs. It is found that the anthropogenic heat input to streams by wastewater effluent has been considerably increasing, and the stream temperature shows a coincidental long-term increasing trend at the rate of 0. 1°C/year and more in winter and early spring. The maximum change is estimated to be more than 4°C in the past 20 years. It is found that increasing anthropogenic heat input by wastewater is a dominant factor of stream temperature changes than other factors such as air temperature increase and warmer seawater intrusion by tidal movement.
Year: 2005