Hydroclimatic influences on non-stationary transit time distributions in a boreal headwater catchment
Hydroclimatic influences on non-stationary transit time distributions in a boreal headwater catchment
复制标题
水文气候对北方水源流域非平稳渡越时间分布的影响
DOI：
10.1016/j.jhydrol.2016.01.079
复制
发表时间：
2016
影响因子：
6.4
通讯作者：
Peralta-Tapia A
中科院分区：
文献类型：
--
作者：
Peralta-Tapia A
了解水是如何通过集水区移动的-从它作为降水进入的时间到它通过径流离开的时间-对于了解水文和地球化学过程至关重要。该路由的基本描述符是渡越时间分布（TTD），其源自保守示踪剂的输入-输出行为，其平均值表示水分子进入和离开流动系统之间经过的平均时间。近几十年来，人们进行了许多通行时间研究，但很少有研究关注以雪为主的集水区。我们收集了一个10年的时间序列的同位素数据（δ 18 O和δ 2 H）的降水和溪流，以估计过境时间分布的特点，在北方的集水区在北方瑞典。我们应用集总参数模型，使用伽玛分布计算的平均过境时间（MTT）的水在整个记录期间，并评估如何过境时间的年际差异与水文气候变异。完整10年期的最佳拟合MTT为650天（Nash-Sutcliff效率= 0.65），而最佳拟合年际MTT范围为300天至1200天。虽然年平均总降水量与年平均最大降水量之间存在弱的负相关关系，但对于年降水输入而言，这种关系更强（r2= 0.53，p = 0.02）。MTT和年降雨量，而不是融雪之间的这种强有力的联系，有很强的影响，了解未来的水文和地球化学过程在北方地区，预测暖冬将转化为更大比例的降水下降为雨，从而缩短MTT集水区。这种变化可能对溶质和污染物的出口产生直接影响。
Understanding how water moves through catchments – from the time it enters as precipitation to when it exits via streamflow – is of fundamental importance to understanding hydrological and biogeochemical processes. A basic descriptor of this routing is the Transit Time Distribution (TTD) which is derived from the input–output behavior of conservative tracers, the mean of which represents the average time elapsed between water molecules entering and exiting a flow system. In recent decades, many transit time studies have been conducted, but few of these have focused on snow-dominated catchments. We assembled a 10-year time series of isotopic data (δ18O and δ2H) for precipitation and stream water to estimate the characteristics of the transit time distribution in a boreal catchment in northern Sweden. We applied lumped parameter models using a gamma distribution to calculate the Mean Transit Time (MTT) of water over the entire period of record and to evaluate how inter-annual differences in transit times relate to hydroclimatic variability. The best fit MTT for the complete 10-year period was 650 days (Nash–Sutcliff Efficiency = 0.65), while the best fit inter-annual MTT ranged from 300 days up to 1200 days. Whilst there was a weak negative correlation between mean annual total precipitation and the annual MTT, this relationship was stronger (r2= 0.53,p= 0.02) for the annual rain water input. This strong connection between the MTT and annual rainfall, rather than snowmelt, has strong implications for understanding future hydrological and biogeochemical processes in boreal regions, given that predicted warmer winters would translate into a greater proportion of precipitation falling as rain and thus shorter MTT in catchments. Such a change could have direct implications for the export of solutes and pollutants.
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河岸带对北方溪流中碱阳离子浓度的控制
影响因子：
4.9
作者：
J. Ledesma;T. Grabs;M. Futter;K. Bishop;H. Laudon;S. Köhler
通讯作者：
S. Köhler
影响因子：
2.6
作者：
Burns, Douglas A.;Plummer, L. Niel;Schlosser, Peter
通讯作者：
Schlosser, Peter
影响因子：
2.4
作者：
Agren, Anneli;Buffam, Ishi;Laudon, Hjalmar
通讯作者：
Laudon, Hjalmar
影响因子：
5.4
作者：
Harman, Ciaran J.
通讯作者：
Harman, Ciaran J.
输入水中氧气 18 含量发生阶跃变化时小耕地流域中水的传输时间
DOI：
--
发表时间：
1996
期刊：
影响因子：
--
作者：
A. Rodhe;L. Nyberg;K. Bishop
通讯作者：
K. Bishop