土壌水分量に基づく森林斜面での不飽和鉛直浸透・先行降雨指標・流出量の検討

• 坂本 康

  山梨大学 大学院医学工学総合研究部

• 芳賀 弘和

  山梨大学

• 伊芸 奈津子

  山梨大学 大学院医学工学総合研究部

• 藤田 昌史

  山梨大学 大学院医学工学総合研究部

• 西田 継

  山梨大学 大学院医学工学総合研究部

書誌事項

タイトル別名

• STUDY ON UNSATURATED VERTICAL FLOW, ANTECEDENT PRECIPITATION INDEX AND DISCHARGE OF FOREST SLOPE ON THE BASIS OF WATER CONTENT OF SOIL

抄録

To clarify the mechanism of water movement through a natural forest slope, its soil water content was measured and discussed on the relation between its change rate and unsaturated vertical flow, antecedent precipitation index (API) and slope discharge. Soil water content was measured during and after rainfall events by electric reflectometers at 3 depths (from 0.1 to 1.0m) of 3 places and its change rate was calculated. The relation between water content of shallow soil and its change rate suggested that the vertical water percolation was caused under conditions of unsaturated hydraulic conductivity proportional to (θ-θ_r)^n₁ (θ: volumetric water content, θ_r: residual volumetric water content, n1: constant) and hydraulic head gradient equal to 1. The relation between averaged water content and values of several types of API showed that API₂(t)=Σi^b₂ P(t-i) (P(t-i): precipitation on the i-th day before the t-th day, b₂:contant) is good as a slope API. The slope discharge could be expressed as a function proportional to (θ-θ_r)^n₂ (n₂:constant) with θ averaged spatially and this function could estimate the discharge from a slope during rainfall.

収録刊行物

• 水工学論文集

  水工学論文集 50 247-252, 2006

  公益社団法人 土木学会

キーワード

• unsaturated vertical flow
• antecedent precipitation index
• slope discharge
• soil water content

詳細情報

• CRID: 1390001205171705728
• NII論文ID: 130004043835
• DOI: 10.2208/prohe.50.247
• ISSN: 18849172
• ISSN: 09167374
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可