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[B-11.2 Impact of Climate Change on Hydrologic Cycles in Cold Regions]

[Contact Person]

Atsushi Yoshii
Section Chief
Environmental Engineering Section
Civil Engineering Research Institute
Hokkaido Development Agency
Hiragishi 1-3, Toyohiraku, Sapporo, Hokkaido, 062 Japan
Tel +81-11-841-1111(Ext.290), Fax +81-11-824-1226

[Total Budget for FY1990-1992]

13,210,000 Yen

[Abstract]

　First, we have collected and investigated the meteorological data such as temperature and precipitation amounts for a past hundred years In Hokkaido. The analyzed results show that few snowfall and snowpack amounts appear to be indicated in a recent couple of years. Then, an attempt was made to develop the snowmelt runoff model based on the remote sensing information in order to investigate the current and future snowmelt runoff situations as well as water resource managements in the cold regions. An attempt was also made to develop the long and short terms runoff model in order to evaluate the annual hydrological cycle in a catchment area. The effect of climate changes on runoff patterns is investigated by the present model. The results show that the hydrological responses are more sensitive to temperature changes than to precipitation changes in Hokkaido because the hydrologic cycle highly depends on the snowmelt pattern.

[Key Words]

Remote sensing, Degree-Day method, Snowpack amount, Snowmelt runoff amount, Long and short terms runoff model