Thermopeaking in Alpine streams: event characterization and time scales
Thermopeaking in Alpine streams: event characterization and time scales
复制标题
DOI：
10.1002/eco.132
复制
发表时间：
2010-05
期刊：
影响因子：
2.6
通讯作者：
G. Zolezzi;A. Siviglia;M. Toffolon;B. Maiolini
中科院分区：
文献类型：
--
作者：
G. Zolezzi;A. Siviglia;M. Toffolon;B. Maiolini
本研究提供了一个详细的量化的“热峰”现象，其中包括流热制度与水力调峰释放从水电厂的急剧间歇性变化。该研究涉及Noce河（北方意大利），这是一条典型的水力调节阿尔卑斯河，储存在高海拔水库中的水与接收水体相比通常具有不同的温度。该分析基于一个河流水温数据集，该数据集在Noce河沿着的四个不同部分以30分钟的间隔连续收集了1年。一个合适的基于阈值的程序被开发出来，以量化热峰的主要特征，这是负责在不同尺度的热变化。小波变换的应用允许分别研究亚日、日和周尺度的热状况变化。此外，在季节尺度上，可以清楚地检测和量化“温暖”和“寒冷”的热峰模式。该研究强调了在多个时间尺度上调查各种短期变化的相关性，以便更好地定量了解河流热状况的复杂性。分析结果提出了重要的跨学科研究问题，涉及热峰的影响以及相关的对生物群落的短期和中期影响，而这些问题在生态研究中研究得相当少。版权所有© 2010约翰威利父子有限公司.
The present study provides a detailed quantification of the ‘thermopeaking’ phenomenon, which consists of sharp intermittent alterations of stream thermal regime associated with hydropeaking releases from hydroelectricity plants. The study refers to the Noce River (Northern Italy), a typical hydropower‐regulated Alpine stream, where water stored in high‐altitude reservoirs often has a different temperature compared with the receiving bodies. The analysis is based on a river water temperature dataset that has been continuously collected for 1 year at 30‐min intervals in four different sections along the Noce River. A suitable threshold‐based procedure is developed to quantify the main characteristics of thermopeaking, which is responsible for thermal alterations at different scales. The application of Wavelet Transform allows to separately investigate the thermal regime alterations at sub‐daily, daily and weekly scales. Moreover, at a seasonal scale, patterns of ‘warm’ and ‘cold’ thermopeaking can be clearly detected and quantified. The study highlights the relevance of investigating a variety of short‐term alterations at multiple time scales for a better quantitative understanding of the complexity that characterizes the river thermal regime. The outcomes of the analysis raise important interdisciplinary research questions concerning the effects of thermopeaking and of the related short‐ and medium‐term effects on biological communities, which have been rather poorly investigated in ecological studies. Copyright © 2010 John Wiley & Sons, Ltd.