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Influences of forested watershed conditions on fluctuations in stream water temperature with special reference to watershed area and forest type

机译：森林流域条件对溪水温度波动的影响，特别要注意流域面积和森林类型

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摘要

In order to gain insight into the effect of watershed conditions on fluctuations in stream water temperature, we statistically analyzed water temperature data for 1 year, using root mean square (Rms) and harmonic (A Amplitude, φ delay time) methods. The average values of delay time (days) between air and water temperatures (T a and T w) of small (< 0.5 ha), medium (0.5–100 ha) and large (> 100 ha) watersheds were 4.53 ± 0.82 days, 11.83 ± 3.88 days and 4.45 ± 1.52 days, respectively. Fluctuations in stream water temperature expressed by Rms (Rms T w/Rms T a) and harmonic methods (A ?T w/A ?T a) in the medium-sized watersheds with moderate slope gradients were 0.37 ± 0.09 and 0.56 ± 0.14, respectively. These values increased in the larger watersheds with low slope gradients, including five large rivers covered by various landscapes, with their averages of 0.53 ± 0.09 and 0.78 ± 0.09, respectively, indicating the influences of solar radiation and heat transfer processes. In the smaller watersheds with high slope gradients, these values were 0.73 ± 0.02 and 0.87 ± 0.03, respectively, suggesting that shorter passage time affected water temperatures. With respect to forest type, these values at badly managed hinoki forest watersheds (0.45 ± 0.04 and 0.73 ± 0.07) were larger than those at broadleaf forest (0.34 ± 0.04 and 0.51 ± 0.12) and well-managed hinoki forest (0.33 ± 0.04 and 0.51 ± 0.07) watersheds, indicating different proportions of flow paths.
机译：为了深入了解流域条件对河流水温波动的影响，我们使用均方根（Rms）和谐波（A振幅，φ延迟时间）方法对1年的水温数据进行了统计分析。小（<0.5公顷），中（0.5–100公顷）和大（> 100公顷）空气和水温（T a 和T w ）之间的延迟时间（天）的平均值）分水岭分别为4.53±0.82天，11.83±3.88天和4.45±1.52天。介质中以Rms（Rms T w / Rms T a ）和谐波方法（A？T w / A？T a ）表示的溪水温度波动中等坡度的大型流域分别为0.37±0.09和0.56±0.14。这些值在具有低坡度的较大流域中有所增加，其中包括五条被各种景观覆盖的大河流，其平均值分别为0.53±0.09和0.78±0.09，表明了太阳辐射和热传递过程的影响。在具有高坡度的较小流域中，这些值分别为0.73±0.02和0.87±0.03，表明较短的通过时间会影响水温。就森林类型而言，经营不善的h木森林流域的这些值（0.45±0.04和0.73±0.07）要大于阔叶林（0.34±0.04和0.51±0.12）和管理良好的h木森林的0.33±0.04和0.51±0.07）分水岭，表明流径比例不同。

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  • 来源
    《Limnology》 |2009年第1期|33-45|共13页
  • 作者

    Luki Subehi; Takehiko Fukushima; Yuichi Onda; Shigeru Mizugaki; Takashi Gomi; Tomomi Terajima; Ken’ichirou Kosugi; Shinya Hiramatsu; Hikaru Kitahara; Koichiro Kuraji; Noriatsu Ozaki;

  • 作者单位

    Graduate School of Life and Environmental Sciences University of Tsukuba Tsukuba 305-8502 Japan;

    Graduate School of Life and Environmental Sciences University of Tsukuba Tsukuba 305-8502 Japan;

    Graduate School of Life and Environmental Sciences University of Tsukuba Tsukuba 305-8502 Japan;

    Graduate School of Life and Environmental Sciences University of Tsukuba Tsukuba 305-8502 Japan;

    Graduate School of Agriculture Tokyo University of Agriculture and Technology Tokyo 183-8509 Japan;

    Disaster Prevention Research Institute Kyoto University Kyoto 611-0011 Japan;

    Graduate School of Agriculture Kyoto University Kyoto 606-8502 Japan;

    Faculty of Agriculture Shinshu University Nagano 399-4598 Japan;

    Faculty of Agriculture Shinshu University Nagano 399-4598 Japan;

    Graduate School of Agricultural and Life Sciences University of Tokyo Aichi 489-0031 Japan;

    Faculty of Engineering Graduate School of Hiroshima University Hiroshima 739-8527 Japan;

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  • 正文语种 eng
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  • 关键词

    Stream water temperature fluctuation; Forested watershed; Root mean square; Harmonic analysis;

    机译：溪水温度波动;森林流域;均方根;谐波分析;

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