[T10912]砂防学会誌64‐1/P3‐10 論文 秋山ほか(4C)

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1 VolNop Effects of the measurement density of soil thickness on prediction of shallow landslide susceptibility Koichi AKIYAMA Taro UCHIDA Keiji TAMURA Koji KAMEE Abstract In this study, we investigated effects of interval of measurement of soil thickness on prediction of shallow landslide susceptibility. Study area is the Aratani district, the West Hiroshima mountain range, where landslides occurred in a heavy rain of June,. We prepared five datasets about soil thickness which have different spatial resolution. We calculated spatial distribution of critical steady-state rainfallrcrequired to cause slope instability. If interval of measurement of soil thickness was high enough, the spatial distribution of critical steady-state rainfallrcwere consistent with the spatial pattern of shallow landslides triggered by the heavy rainfall of June,. While, the critical steady-state rainfallrccould not explain the location of shallow landslides at the point where we did not measure soil thickness. Based on these analysis, we considered measurement intervals of soil thickness have to be shorter than width of the old shallow landslide scars. Key wordsshallow landslide, Soil thickness, slope gradient, upslope contributing area, penetration test Montgomery and Dietrich Wu and SidlePack et al Heimsath et al. Dietrich et. al Member, Public Works Research Institutek-akiyapwri.go.jp Member, Japan Sabo Association

2 Vol NoMay rc rc Ks tan I cos Icγ t h cos Isin I cos I tanφ rc Aγ w cos I tanφ γ sγ tsin I cos I tanφ rcms, I Am m, h m, cknm φ Ksms, γ s knm γ t knm γ wknm rcms rc Ks h tan I rc A rc m Study area rc mmh km km mmmm km JGS mm kgcm m mm Nd cm Nd

3 秋山ら 土層厚の計測密度が表層崩壊の発生予測に及ぼす影響 表 検討ケース Table Study case の土層厚の設定は 図 に示す土層厚の計測線上の 計測点を点間隔で抽出し ケースで分割したm メ 土層厚 ケース 3 3 3 6 測定 密度 地点数 6 ッシュに配点した 土層厚はケースと同様な方法で設 測定 間隔 m 6 定した また ケースおよびケース3の土層厚の設定 は ケースで設定したm メッシュを縦横 の メッシュ ケース 3 3のメッシュ ケース3 ご とに区分し 区分したメッシュ並びにメッシュの中 からメッシュを抽出した メッシュの抽出にあたって は メッシュ間隔が等間隔となるようにした 抽出した メッシュにおいて土層厚の計測点と合致する場合は そ のまま計測値を土層厚として設定し 計測点がないメッ シュは内挿計算より求めた なお 内挿方法は TIN 法 Triangulated Irregular Network を用いた また ケー スの土層厚は 流域平均土層厚 cm とした 集水面積 斜面勾配の算定 内田ら は 近年 土層内の水の流れは 地表 スではセット ケース ケースでは 面の地形より岩盤面の地形の影響を強く受けることなど セット ケース 3 ケース3では が明らかにされてきたことを踏まえ 地形量を岩盤面の セット ケース 3 6 地形および地表面の地形の両者を用い 最小定常崩壊発 を設定した 表 図 ケースの土層厚の設定 生降雨強度 rc を算出した その結果 差は小さいも は 対象地域内をm 正方形メッシュで分割し 分割 のの 岩盤面の地形を用いた場合の方が表層崩壊の発生 したメッシュに土層厚計測点の 点を配点した メ をよりよく再現できることを示した そこで 本研究に ッシュ内に土層厚計測点が複数配点された場合は 近傍 おいても 集水面積および斜面勾配の計算は 岩盤面を のメッシュに振り分けた 土層厚計測点が配点された 対象に行うこととし 検討ケースごとに行った メッシュは 土層厚の計測値を土層厚とし その他 各岩盤面の標高データは 項で作成したm 正方 のメッシュは内挿計算により土層厚を設定した ケース 形メッシュにレーザープロファイラデータ mdem 図 土層厚測定密度の設定 Fig Density of measurement for soil thickness

4 Vol NoMay Soil conditions Ks c φ γ s γ t γ w cms knm knm knm knm D-Infinity Flow Direction Tarboton D-Infinity Flow Direction rc rc rc rc rc distribution chart rc rc rc mmh rc rc mmh mmh mmh rc mmh Fs mmh mmh Calculation results mmh rc mmh mmh mmh mmh

5 Relationship between accuracy rate and coverage dataset Relationship between accuracy rate and coverage rc mmh rc mmh rc mmh rc rc r The relationship between rcmmhof caseand rcmmhof each case r in the figures represent rank correlation coefficients

6 Vol NoMay correlations list rc rc The frequency of the ratio of rc of each case to rc of case rc rc rc abc rc rc rc defg rc rc rc rc rc rc rc The frequency of the ratio of soil thickness of each case to soil thickness of case

7 The frequency of the ratio of gradient slope of each case to gradient slope of case The frequency of the ratio of upslope contributing area of each case to upslope contributing area of case rc rc rc rc rc

8 Vol NoMay mmm m m m rc rc rc rc rc Heimsath et al.stochastic processes of soil production and transport : erosion rates, topographic variation and cosmogenic nuckides in the oregon coast range., Earth Surface Processes and Landforms,Vol., p.. VolNop VolNop VolNop Volp Montgomery, D. R., and W. E. Dietrich.A physicallybased model for the topographic control on shallow landsliding., Water Resources Research Vol., p.. VolNop VolNop p VolNo p Pack, R. T., D. G. Tarboton and C. N. Goodwin.The SINMAP Approach to Terrain Stability Mapping.,Paper Submitted to th Congress of the International Association of Engineering Geology, Vancouver, British Columbia, Canada. VolNop Tarboton, D. G.A new method for the determination of flow directions and upslope areas in grid digital elevation models.,water Resources Research Vol., p.. VolNop W. E. Dirtrich and Robert Reiss and Mei-Ling Hsu and D.R. Montgomery.A process-based Model for colluvial soil depth and shallow landsliding usig digital elevation data., Hydrological processes. Vol., p.. Wu, W. and Sidle, R. C.A distributed slope stability model for steep forested watersheds.,water Resources Research Vol., p..

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