Fingerprinting hydrological and biogeochemical drivers of freshwater quality
Fingerprinting hydrological and biogeochemical drivers of freshwater quality
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淡水质量的指纹水文和生物地球化学驱动因素
DOI：
10.1002/hyp.13973
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发表时间：
2020
影响因子：
3.2
通讯作者：
Heathwaite A
中科院分区：
文献类型：
--
作者：
Heathwaite A
由于现场传感器高频水质测量的进步，现在可以了解溪流中的水文冲刷和生物地球化学循环之间的相互作用。人们通常认为风暴事件是生物地球化学过程受到抑制并且溶质和颗粒物的纵向运输占主导地位的时期。然而，高频数据表明，昼夜循环是水质时间序列的一个共同特征，并且可以在风暴事件期间保留下来，尤其是低强度的风暴事件。在本研究中，我们挖掘高频数据集，并使用两个关键的水化学指标（滞后和冲洗指数）来评估三级农业河流中浓度-流量关系的多样性。我们表明，从滞后指数推断出的动员模式随季节变化，在冬季高强度风暴事件期间，主要是来自地表和近河流源的快速动员，而在夏季低强度风暴事件期间，主要是来自地下源的延迟动员。使用动态谐波回归，我们能够将风暴事件期间的浓度信号分离为水文冲刷（使用趋势作为代理）和生物地球化学循环（使用昼夜循环的幅度作为代理）。我们根据典型的 c-q 响应确定了三组水质参数：冲洗主导参数（磷和沉积物）、混合冲洗和循环参数（硝态氮、比电导率和 pH）以及循环主导参数（溶解氧、氧化还原电位和水温）。我们的结果表明，尽管风暴之间的水化学响应存在很大的多样性，但风暴事件的强度和时间在控制每种水质成分的流动、冲刷和循环行为的类型方面发挥着关键作用。水化学指数可用于识别水文扰动对淡水质量的影响，并可用于确定全球变化对河流生态的影响。
Understanding the interplay between hydrological flushing and biogeochemical cycling in streams is now possible owing to advances in high‐frequency water quality measurements with in situ sensors. It is often assumed that storm events are periods when biogeochemical processes become suppressed and longitudinal transport of solutes and particulates dominates. However, high‐frequency data show that diel cycles are a common feature of water quality time series and can be preserved during storm events, especially those of low‐magnitude. In this study, we mine a high‐frequency dataset and use two key hydrochemical indices, hysteresis and flushing index to evaluate the diversity of concentration‐discharge relationships in third order agricultural stream. We show that mobilization patterns, inferred from the hysteresis index, change on a seasonal basis, with a predominance of rapid mobilization from surface and near stream sources during winter high‐magnitude storm events and of delayed mobilization from subsurface sources during summer low‐magnitude storm events. Using dynamic harmonic regression, we were able to separate concentration signals during storm events into hydrological flushing (using trend as a proxy) and biogeochemical cycling (using amplitude of a diel cycle as a proxy). We identified three groups of water quality parameters depending on their typicalc‐qresponse: flushing dominated parameters (phosphorus and sediments), mixed flushing and cycling parameters (nitrate nitrogen, specific conductivity and pH) and cycling dominated parameters (dissolved oxygen, redox potential and water temperature). Our results show that despite large storm to storm diversity in hydrochemical responses, storm event magnitude and timing have a critical role in controlling the type of mobilization, flushing and cycling behaviour of each water quality constituent. Hydrochemical indices can be used to fingerprint the effect of hydrological disturbance on freshwater quality and can be useful in determining the impacts of global change on stream ecology.
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使用连续的浊度和排放记录来估计磷出口的非线性经验模型
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
C. Minaudo;R. Dupas;C. Gascuel;O. Fovet;P. Mellander;P. Jordan;M. Shore;F. Moatar
通讯作者：
F. Moatar
影响因子：
1.8
作者：
D. Burns;Matthew P. Miller;B. Pellerin;P. Capel
通讯作者：
P. Capel
影响因子：
3.7
作者：
Lansdown, K.;Heppell, C. M.;Zhang, H.
通讯作者：
Zhang, H.
影响因子：
4.4
作者：
Rasmussen, SO;Andersen, KK;Ruth, U
通讯作者：
Ruth, U
影响因子：
4.6
作者：
Aubert AH;Thrun MC;Breuer L;Ultsch A
通讯作者：
Ultsch A