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Title: 芦生演習林内の急峻地帯における小流域の流出特性
Other Titles: Characteristics of Stream flow at a Small Watershed in Steep Slope Area of Kyoto University Forest in Ashiu
Authors: 中島, 皇  KAKEN_id
福嶌, 義宏  KAKEN_name
大畠, 誠一  KAKEN_name
Author's alias: Nakashima, Tadashi
Fukushima, Yoshihiro
Oohata, Sei-Ichi
Issue Date: 21-Dec-1992
Publisher: 京都大学農学部附属演習林
Journal title: 京都大学農学部演習林報告
Volume: 64
Start page: 75
End page: 87
Abstract: 京都大学芦生演習林の気象・水文を把握するために, 演習林全体を含むおよそ5000haの由良川源流域において調査用施設を配置し, 観測を開始した。由良川支流の内杉川 (第5林班) に設定された幽仙谷試験流域は芦生演習林の中でも高原部と河谷部をつなぐ急斜面に位置し, 流域面積は7. 95ha, 地質は丹波帯の中生層で頁岩を主体としてチャート, 砂岩を含んでいる。植生はスギと広葉樹 (ブナ, ウラジロガシ) が混交し, 標高は490 - 740mでほぼ南向きの流域であり, 芦生の比較的標高の低い地域を代表する天然林の一つである。今回はこの流域の1991年の水文観測結果を報告する。まず, 芦生における気温, 日射量の観測結果から水循環モデルの中の蒸発散量の推定に, Hamon式が適用可能なことを示した。また, 無雪期のハイドログラフにおいて水循環モデルの流域定数を決定することにより, 他の中・古生層の流域及び花崗岩流域との比較をおこない, 中・古生層の流域および本流域の流域特性について検討を加えた。次に, 積雪期においては積雪・融雪総合化モデルによってハイドログラフの再現を試み, 気温のみに注目する方法や熱収支法による結果を示し, 今後の問題点を指摘した。
Hydrological observations have been made in the Yusendani Experimental Watershed situated on the source area of Yura River in Kyoto Prefecture, for understanding the meteorological and hydrological conditions of the University Forest in Ashiu. The Yusendani watershed is underlain by Mesozoic and Paleozoic Era formations is covered with natural forests of Cryptomeria japonica, Fagus crenata and Quercus salicina. The basin area of this watershed is 7.95 ha. The altitude of the watershed ranges 490 m - 740 m. This natural forest represents the lower parts of Ashiu. The results are as follows, 1) It is possible to adapt the Hamon equation to presume the potential evapotranspiration, owing to the observations of temperature in Ashiu. The hourly data of rainfall and discharge during non-snow seasons from April to October of 1991 were used for determining the runoff constants on HYCYMODEL which is a synthetic runoff model. Using those runoff constans, characteristics of streamflow of this watershed are compared with those of another Mesozoic and Paleozoic Era formations watershed and the weathered granite watershed. 2) As the runoff constants already were determined from data in a non-snow season, the hydrograph of stream flow can be calculated by snowpack and snowmelt model in point of temperature or radiation. The points at issue about the snowpack and snowmelt mechanism are indicated.
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