都市域・水体をも考慮した蒸発散モデルの構築とその琵琶湖流域への適用

Abstract

A simple biosphere model that can be applied to complex land-use (including urban area and water body) surface (SiBUC) is presented here.In the SiBUC model, the surface is divided into four land-use categories urban canopy, urban ground, water body and green area.This green area is described by the same way as the SiB model of Sellers et al. (1986)8), and further divided into three parts ; vegetation canopy, ground cover and bare soil surface.The fractional areas of these surfaces are assigned to each grid.SiBUC has twelve prognostic physical-state variables five temperatures, four interception water stores and three soil moisture stores.We tested SiBUC by using the micrometeorological data as atmospheric forcing variables, and the sensitivity of the model's output to changes in the various model parameters was examined.We applied SiBUC to the basin of Lake Biwa, and the heat balance of each land-use was well predicted.