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Watershed Planning within a Quantitative Scenario Analysis Framework
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Changes in peak flow with decreased forestry practices: analysis using watershed runoff data.

Hikaru Komatsu1, Yoshinori Shinohara, Tomonori Kume

  • 1Kasuya Research Forest, Kyushu University, Kasuya, Fukuoka 811-2415, Japan. komatsu@forest.kyushu-u.ac.jp

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Decreased forestry practices in Japan have not led to a significant increase in flood risk at the watershed scale. Analysis of precipitation and runoff data suggests flood risk may be lower than previously assumed.

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Area of Science:

  • Hydrology
  • Forestry Science
  • Environmental Science

Background:

  • Forestry practices like thinning and pruning have declined since the 1980s.
  • Previous studies indicated increased flood risk at a plot scale due to reduced forestry.
  • Flood disasters typically occur at a watershed scale, which remained unexamined.

Purpose of the Study:

  • To investigate changes in peak flow and flood risk at a watershed scale.
  • To analyze the relationship between decreased forestry practices and runoff frequency.
  • To assess flood risk in Japanese coniferous plantations with reduced management.

Main Methods:

  • Analyzed daily precipitation (P) and runoff (Q) data from 1979-2007 at the Terauchi watershed.
  • Categorized P and Q data into distinct magnitude classes (14 for P, 15 for Q).
  • Examined frequency distribution changes for each class over the study period, accounting for precipitation variations.

Main Results:

  • No significant increasing trend was found in any precipitation or runoff class frequency.
  • After adjusting for interannual precipitation variability, only moderate runoff classes showed a slight increase.
  • The overall findings indicate a less pronounced increase in flood risk than anticipated.

Conclusions:

  • Reduced forestry practices may not elevate flood risk at a watershed scale as much as previously suggested.
  • The study highlights the importance of watershed-scale analysis for understanding flood risk.
  • Further research may be needed to fully elucidate the complex relationship between forestry management and hydrological responses.