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Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
雨量の空間的変動と,ワシントン・カスケード (Washington Cascades) 全体の長期の侵食率を組み合わせた
Peter W Reiners1, Todd A Ehlers, Sara G Mitchell
1Department of Geology and Geophysics, Yale University, 210 Whitney Avenue, New Haven, Connecticut 06511, USA. peter.reiners@yale.edu
Nature
|December 12, 2003
まとめ
ワシントン州のカスケード山脈では,長期の侵食率は,降水パターンに密接に追随しています. これは,気候が地質的な時間尺度で山の形成と侵食に大きく影響することを示唆しています.
科学分野:
- 地質科学は地質科学である.
- 気候科学 気候科学
- テクトニクス (地質学) とは
背景:
- 構造的に活発な山脈は,気候,構造,地形との複雑な相互作用を示しています.
- 理論的モデルでは,岩石の上昇が降雨を増加させ,侵食を集中させ,さらなる上昇に影響を与えるフィードバックを提案しています.
研究 の 目的:
- カスカッド山脈全域における長期の侵食率と現代の降雨量との相関を調査する.
- 気候と地質学過程の結びつきに関する観測可能な証拠を山脈規模のスケールで提供すること.
主な方法:
- アパタイト (U-Th) /ヘルの冷却年齢を分析して,長期の侵食率 (>10^610^7年) を推測する.
- 推論された侵食率とカスケード川の現代の年間平均降水量のデータを比較する.
主要な成果:
- 熱クロノロジーから推論された侵食率は,範囲全体で数桁の大きさで異なっています.
- これらの侵食率は,現代の年間平均降水率を密接に追っている.
- 侵食と降雨の最大値は,地形上の山頂の風向きに位置しており,気候的に集中した侵食を示唆しています.
結論:
- 山岳スケールでの降水率と長期の侵食率の強い結合を示しています.
- 気候的に焦点を当てた侵食が,カスケード山脈の西側側で,山脈が地形的に安定した状態にある場合,より速い岩石の上昇を促す可能性があることを示唆しています.
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