Urbanization influences on stream temperature behavior within low-discharge headwater streams
スポンサーリンク
概要
- 論文の詳細を見る
Urbanization has compromised water quality globally, especially stream temperature, by reducing shading and converting natural landscapes to impermeable surface coverage (ISC). We analyze stream-air temperature relationships in a low-order, moderate-gradient urban stream using three years of stream temperature data collected at nine monitoring sites. At the sub-catchment scale, ISC increases from 13.7% to 24.3% among sites, causing mean summer temperatures to increase 4–5°C or 0.37°C for each 1% increase in ISC. ISC at these spatial scales influences stream-air temperature relationships at daily-, weekly-, and monthly-averaged time scales. ISC at smaller spatial scales within a 25-m buffer of the stream, which ranges from 1% to 75%, does not correlate with mean stream temperatures at any temporal scale; however, buffer ISC does correlate with short-term temperature surge events, which we define as an increase of at least 1°C within 15 minutes. Mean surge amplitudes range from 1.90°C to 3.27°C in areas with low and high buffer ISC, respectively. Our results show that ISC influences stream temperatures at stream buffer and sub-catchment spatial scales and daily, weekly, and monthly temporal scales, and may render the concept of equilibrium temperature obsolete for predicting stream temperatures, especially in low-order, headwater streams.
論文 | ランダム
- 1997年度海外直接投資アンケ-ト調査結果報告
- 中南米主要国の直接投資統計
- 日本住血吸虫症の現況とその対策の問題点(第6回基礎医学談話会,研究会記録)
- 東京都多摩地区の仔ネコと仔イヌにおけるコクシジウムのオーシストの保有状況
- 21 数種殺虫剤のニワトリヌカカ Culicoides arakawae 成虫に対する効果