都市河川感潮域における水熱エネルギー利用が河川水温に与える影響に関する研究

The influence of water heat energy use on stream temperature in urban rivers under tidal variation

Kinouchi Tsuyoshi

Kawahara Yoshihisa

Suetsugi Tadashi

Kobayashi Hiroaki

水工学論文集

To predict the water temperature in lower reaches of urban rivers, field measurements and model development were performed for simultaneous transport of water and heat in a stream. Detailed information on river flow and heat transport under tidal motion was obtained through an intensive measurement in the lower reach of the Ara River. Based on the knowledge of time variations and cross-sectional profiles of the flow and the stream temperature, a one-dimensional dynamic model is developed to predict flow and water temperature in tidally affected urban streams. The model takes into account of tidal motion, longitudinal dispersion, water exchange with tributaries, wastewater effluent and the heat exchange between the atmosphere and the stream water. Using the calibrated model, effects of heated water discharge on the stream temperatures due to the district heating and cooling system were estimated for a possible scenario in which the river thermal energy is used through the water heat pump technology.

Stream temperature

tidal variation

urban river

heat energy

district heating and coolirzg system

field measurement

one-dimensional modeling

Construction. Civil engineering [ 510 ]

jpn

土木学会

[ISSN] 0916-7374

[NCID] AN10426673