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首页> 外文期刊>Journal of the American Water Resources Association >TEMPORAL AND SPATIAL TURBIDITY PATTERNS OVER 30 YEARS IN A MANAGED FOREST OF WESTERN WASHINGTON
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TEMPORAL AND SPATIAL TURBIDITY PATTERNS OVER 30 YEARS IN A MANAGED FOREST OF WESTERN WASHINGTON

机译：华盛顿西部人工林30多年来的时空湍流模式

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Forest practices have progressively changed over the last 30 years in the Pacific Northwest to address water quality concerns. There have been some assessments of these new management practices made at a site scale but very few studies have attempted to evaluate their efficacy at reducing cumulative sediment production at a watershed scale. Such an evaluation is difficult due to the spatial and temporal variability in sediment delivery and transport processes. Due to this inherent variability, detecting a response to management changes requires a long-term data record. We utilized a water quality dataset collected over 30 years at four locations in the Deschutes River watershed (western Washington) to assess trends in turbidity and whether sediment control procedures implemented over this time period had any detectable influence. The sample sites ranged from small headwater streams (2.4 and 3.0 km~2) to the mainstem of the Deschutes River (150 km~2). Declining trends in turbidity were detected at all the permanently monitored sites. The mainstem Deschutes River site, which integrates sediment processes from the entire study watershed, showed dramatic declines in turbidity even with continued active forest management. For the small basins, logging and road construction occurred in the 1970s and 1980s and turbidity declined thereafter, achieving prelogging levels by 2000. There are no temporal trends in flow that could be responsible for the observed trends in turbidity. Our results suggest that increased attention to reducing sediment production from roads and minimizing the amount of road runoff reaching stream channels has been the primary cause of the declining turbidity levels observed in this study.
机译：在过去的30年中，西北太平洋地区的森林作风已逐渐发生变化，以解决水质问题。这些新的管理方法已经在场地规模上进行了一些评估，但是很少有研究试图评估它们在流域范围内减少累积沉积物产生的功效。由于沉积物的输送和运输过程在空间和时间上的变化，这种评估是困难的。由于这种固有的可变性，检测对管理变更的响应需要长期的数据记录。我们利用在Deschutes河流域（华盛顿州西部）四个地点收集的30多年来的水质数据集来评估浊度趋势，以及在此期间实施的沉积物控制程序是否具有可检测的影响。采样点的范围从小的上游水流（2.4和3.0 km〜2）到Deschutes河的主干河（150 km〜2）。在所有永久性监测地点都发现了浊度下降的趋势。贯穿整个研究流域的泥沙过程的主要干渠Deschutes河站点显示，即使持续进行积极的森林管理，浑浊度也会急剧下降。对于小盆地，在1970年代和1980年代发生了伐木和修路，随后浊度下降，到2000年达到了预测水平。没有随时间流逝的趋势可以解释所观察到的浊度趋势。我们的研究结果表明，越来越多的人关注减少道路上的泥沙产生，并最大程度地减少流入河道的径流，这是本研究中浊度下降的主要原因。

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