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
- 17. 悪性胸膜中皮腫と鑑別を要した肺腺癌の1例 : 第22回日本肺癌学会北陸支部会
- 9. 興味ある経過をたどった重複癌の一例 : 第22回日本肺癌学会北陸支部会
- P-27 初診時より気管狭窄を呈していた 5 例の治療経験(示説肺癌 (2))
- 1. 気管支性嚢胞に合併した肺癌の一例(第8回日本気管支学会北陸地方会)
- 13.小腸穿孔をきたした肺癌の一例(第21回日本肺癌学会北陸地方会)