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Dynamic rainfall erosivity estimates derived from IMERG data 根据IMERG数据估算的动态降雨侵蚀力
1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2023-10-09 DOI: 10.5194/hess-27-3547-2023
Robert A. Emberson
Abstract. Soil degradation is a critical threat to agriculture and food security around the world. Understanding the processes that drive soil erosion is necessary to support sustainable management practices and to reduce eutrophication of water systems from fertilizer runoff. The erosivity of precipitation is a primary control on the rate of soil erosion, but to calculate erosivity high-frequency precipitation data are required. Prior global-scale analysis has almost exclusively used ground-based rainfall gauges to calculate erosivity, but the advent of high-frequency satellite rainfall data provides an opportunity to estimate erosivity using globally consistent gridded satellite rainfall. In this study, I have tested the use of IMERG (Integrated Multi-satellitE Retrievals for GPM, Global Precipitation Mission) rainfall data to calculate global rainfall erosivity. I have tested three different approaches to assess whether simplification of IMERG data allows for robust calculation of erosivity, finding that the highest-frequency 30 min data are needed to best replicate gauge-based estimates. I also find that in areas where ground-based gauges are sparse, there is more disparity between the IMERG-derived estimates and the ground-based results, suggesting that IMERG may allow for improved erosivity estimates in data-poor areas. The global extent and accessibility of IMERG data allow for regular calculation of erosivity in a month-to-month time frame, permitting improved dynamic characterization of rainfall erosivity across the world in near-real time. These results demonstrate the value of satellite data to assess the impact of rainfall on soil erosion and may benefit practitioners of sustainable land management planning.
摘要土壤退化对世界各地的农业和粮食安全构成严重威胁。了解驱动土壤侵蚀的过程对于支持可持续管理实践和减少肥料径流造成的水系统富营养化是必要的。降水的侵蚀力是土壤侵蚀速率的主要控制因素,但要计算侵蚀力,需要高频降水数据。先前的全球尺度分析几乎完全使用地面雨量计来计算侵蚀力,但高频卫星降雨数据的出现提供了使用全球一致网格卫星降雨来估计侵蚀力的机会。在本研究中,我测试了使用IMERG(全球降水任务综合多卫星检索)降雨数据来计算全球降雨侵蚀力。我测试了三种不同的方法来评估IMERG数据的简化是否允许对侵蚀力进行可靠的计算,发现需要最高频率的30分钟数据才能最好地复制基于测量的估计。我还发现,在地面测量仪稀少的地区,IMERG得出的估算结果与地面测量仪得出的结果之间存在更大的差异,这表明IMERG可能会改善数据贫乏地区的侵蚀力估算。IMERG数据的全球范围和可访问性允许在每月的时间框架内定期计算侵蚀力,从而可以近实时地改进全球降雨侵蚀力的动态特征。这些结果证明了卫星数据在评估降雨对土壤侵蚀的影响方面的价值,并可能使可持续土地管理规划的实践者受益。
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引用次数: 0
Modelling the regional sensitivity of snowmelt, soil moisture, and streamflow generation to climate over the Canadian Prairies using a basin classification approach 利用流域分类方法模拟加拿大大草原上融雪、土壤湿度和河流生成对气候的区域敏感性
1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2023-10-09 DOI: 10.5194/hess-27-3525-2023
Zhihua He, Kevin Shook, Christopher Spence, John W. Pomeroy, Colin Whitfield
Abstract. This study evaluated the effects of climate perturbations on snowmelt, soil moisture, and streamflow generation in small Canadian Prairies basins using a modelling approach based on classification of basin biophysical characteristics. Seven basin classes that encompass the entirety of the Prairies Ecozone in Canada were determined by cluster analysis of these characteristics. Individual semi-distributed virtual basin (VB) models representing these classes were parameterized in the Cold Regions Hydrological Model (CRHM) platform, which includes modules for snowmelt and sublimation, soil freezing and thawing, actual evapotranspiration (ET), soil moisture dynamics, groundwater recharge, and depressional storage dynamics including fill and spill runoff generation and variable connected areas. Precipitation (P) and temperature (T) perturbation scenarios covering the range of climate model predictions for the 21st century were used to evaluate climate sensitivity of hydrological processes in individual land cover and basin types across the Prairies Ecozone. Results indicated that snow accumulation in wetlands had a greater sensitivity to P and T than that in croplands and grasslands in all basin types. Wetland soil moisture was also more sensitive to T than the cropland and grassland soil moisture. Jointly influenced by land cover distribution and local climate, basin-average snow accumulation was more sensitive to T in the drier and grassland-characterized basins than in the wetter basins dominated by cropland, whilst basin-average soil moisture was most sensitive to T and P perturbations in basins typified by pothole depressions and broad river valleys. Annual streamflow had the greatest sensitivities to T and P in the dry and poorly connected Interior Grasslands (See Fig. 1) basins but the smallest in the wet and well-connected Southern Manitoba basins. The ability of P to compensate for warming-induced reductions in snow accumulation and streamflow was much higher in the wetter and cropland-dominated basins than in the drier and grassland-characterized basins, whilst decreases in cropland soil moisture induced by the maximum expected warming of 6 ∘C could be fully offset by a P increase of 11 % in all basins. These results can be used to (1) identify locations which had the largest hydrological sensitivities to changing climate and (2) diagnose underlying processes responsible for hydrological responses to expected climate change. Variations of hydrological sensitivity in land cover and basin types suggest that different water management and adaptation methods are needed to address enhanced water stress due to expected climate change in different regions of the Prairies Ecozone.
摘要本研究利用基于流域生物物理特征分类的建模方法,评估了气候扰动对加拿大小草原流域融雪、土壤湿度和河流生成的影响。通过对这些特征的聚类分析,确定了涵盖加拿大整个草原生态区的七个盆地类别。代表这些类别的单个半分布式虚拟流域(VB)模型在寒区水文模型(CRHM)平台中进行了参数化,该模型包括融雪和升华、土壤冻结和融化、实际蒸散发(ET)、土壤水分动态、地下水补给和洼地储存动态(包括填溢径流生成和可变连接区域)模块。利用覆盖21世纪气候模式预测范围的降水(P)和温度(T)扰动情景,评估了草原生态区各土地覆盖和流域类型水文过程的气候敏感性。结果表明,在所有流域类型中,湿地积雪对磷、T的敏感性均高于农田和草地。湿地土壤水分对T的敏感性也高于农田和草地土壤水分。在土地覆盖分布和局地气候的共同影响下,以干旱和草地为特征的流域平均积雪量对T的敏感性高于以农田为特征的湿润流域,而以坑洼和宽阔河谷为特征的流域平均土壤湿度对T和P的扰动最为敏感。在干旱且连通性差的内陆草原流域(见图1),年流量对T和P的敏感性最大,而在湿润且连通性好的南马尼托巴盆地,年流量对T和P的敏感性最小。在湿润和以农田为主的流域,磷对变暖导致的积雪和水流减少的补偿能力要比干旱和以草地为特征的流域高得多,而6°C最大预期升温引起的耕地土壤水分减少可以被所有流域增加11%的磷所完全抵消。这些结果可用于(1)确定对气候变化水文敏感性最大的地点;(2)诊断对预期气候变化水文响应的潜在过程。土地覆盖和流域类型水文敏感性的变化表明,需要采取不同的水资源管理和适应方法来应对草原生态区不同地区因预期气候变化而加剧的水资源压力。
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引用次数: 0
Calibrating macroscale hydrological models in poorly gauged and heavily regulated basins 在计量不良和管制严格的流域校准宏观尺度水文模型
1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2023-10-06 DOI: 10.5194/hess-27-3485-2023
Dung Trung Vu, Thanh Duc Dang, Francesca Pianosi, Stefano Galelli
Abstract. The calibration of macroscale hydrological models is often challenged by the lack of adequate observations of river discharge and infrastructure operations. This modeling backdrop creates a number of potential pitfalls for model calibration, potentially affecting the reliability of hydrological models. Here, we introduce a novel numerical framework conceived to explore and overcome these pitfalls. Our framework consists of VIC-Res (a macroscale model setup for the Upper Mekong Basin), which is a novel variant of the Variable Infiltration Capacity (VIC) model that includes a module for representing reservoir operations, and a hydraulic model used to infer discharge time series from satellite data. Using these two models and global sensitivity analysis, we show the existence of a strong relationship between the parameterization of the hydraulic model and the performance of VIC-Res – a codependence that emerges for a variety of performance metrics that we considered. Using the results provided by the sensitivity analysis, we propose an approach for breaking this codependence and informing the hydrological model calibration, which we finally carry out with the aid of a multi-objective optimization algorithm. The approach used in this study could integrate multiple remotely sensed observations and is transferable to other poorly gauged and heavily regulated river basins.
摘要由于缺乏对河流流量和基础设施运行的充分观测,宏观尺度水文模型的校准经常受到挑战。这种建模背景为模型校准创造了许多潜在的陷阱,可能影响水文模型的可靠性。在这里,我们介绍了一个新的数字框架,旨在探索和克服这些陷阱。我们的框架包括VIC- res(湄公河上游流域的宏观尺度模型设置),这是可变入渗能力(VIC)模型的一个新变体,其中包括一个表示水库运行的模块,以及一个用于从卫星数据推断流量时间序列的水力模型。使用这两个模型和全局敏感性分析,我们表明水力模型的参数化与VIC-Res性能之间存在很强的关系-我们考虑的各种性能指标出现了相互依赖关系。利用敏感性分析的结果,我们提出了一种打破这种相互依赖的方法,并为水文模型校准提供了信息,最后我们借助多目标优化算法进行了水文模型校准。本研究中使用的方法可以整合多个遥感观测,并可转移到其他测量不足和监管严格的河流流域。
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引用次数: 0
To what extent does river routing matter in hydrological modeling? 在水文建模中,河流走向的重要性有多大?
1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2023-10-06 DOI: 10.5194/hess-27-3505-2023
Nicolás Cortés-Salazar, Nicolás Vásquez, Naoki Mizukami, Pablo A. Mendoza, Ximena Vargas
Abstract. Spatially distributed hydrology and land surface models are typically applied in combination with river routing schemes that convert instantaneous runoff into streamflow. Nevertheless, the development of such schemes has been somehow disconnected from hydrologic model calibration research, although both seek to achieve more realistic streamflow simulations. In this paper, we seek to bridge this gap to understand the extent to which the configuration of routing schemes affects hydrologic model parameter searches in water resources applications. To this end, we configure the Variable Infiltration Capacity (VIC) model coupled with the mizuRoute routing model in the Cautín River basin (2770 km2), Chile. We use the Latin hypercube sampling (LHS) method to generate 3500 different model parameters sets, for which basin-averaged runoff estimates are obtained directly (no routing or instantaneous runoff case) and are subsequently compared against outputs from four routing schemes (unit hydrograph, Lagrangian kinematic wave, Muskingum–Cunge, and diffusive wave) applied with five different routing time steps (1, 2, 3, 4, and 6 h). The results show that incorporating routing schemes may alter streamflow simulations at sub-daily, daily, and even monthly timescales. The maximum Kling–Gupta efficiency (KGE) obtained for daily streamflow increases from 0.64 (instantaneous runoff) to 0.81 (for the best routing scheme), and such improvements do not depend on the routing time step. Moreover, the optimal parameter sets may differ depending on the routing scheme configuration, affecting the baseflow contribution to total runoff. Including routing models decreases streamflow values in flood frequency curves and may alter the probabilistic distribution of the medium- and low-flow segments of the flow duration curve considerably (compared to the case without routing). More generally, the results presented here highlight the potential impacts of river routing implementations on water resources applications that involve hydrologic models and, in particular, parameter calibration.
摘要空间分布的水文和地表模型通常与将瞬时径流转化为径流的河流路线方案相结合。然而,这些方案的发展在某种程度上与水文模型校准研究脱节,尽管两者都寻求实现更现实的水流模拟。在本文中,我们试图弥合这一差距,以了解路由方案的配置在多大程度上影响水资源应用中的水文模型参数搜索。为此,我们在智利Cautín河流域(2770平方公里)配置了可变入渗能力(VIC)模型和mizuRoute路由模型。我们使用拉丁超立方采样(LHS)方法生成3500个不同的模型参数集,直接获得流域平均径流估计(没有路由或瞬时径流情况),随后与四种路由方案(单位线、拉格朗日运动波、Muskingum-Cunge和扩散波)的输出进行比较,采用五种不同的路由时间步长(1,2,3,4,结果表明,在亚日、日甚至月尺度上,引入路由方案会改变径流模拟。最大克林-古普塔效率(KGE)从0.64(瞬时径流)增加到0.81(最佳路由方案),这种改善不依赖于路由时间步长。此外,最优参数集可能因路由方案配置而异,从而影响基流对总径流的贡献。纳入路径模型降低了洪水频率曲线中的流量值,并可能显著改变流时曲线中低流量段的概率分布(与不纳入路径模型的情况相比)。更一般地说,这里提出的结果强调了河流路线实施对涉及水文模型,特别是参数校准的水资源应用的潜在影响。
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引用次数: 0
Spatial distribution and controls of snowmelt runoff in a sublimation-dominated environment in the semiarid Andes of Chile 智利半干旱安第斯山脉升华环境下融雪径流的空间分布和控制
1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2023-09-29 DOI: 10.5194/hess-27-3463-2023
Álvaro Ayala, Simone Schauwecker, Shelley MacDonell
Abstract. Sublimation is the main ablation component of snow in the upper areas of the semiarid Andes (∼ 26 to ∼ 32∘ S and ∼ 69 to ∼ 71∘ W). This region has elevations up to 6000 m, is characterized by scarce precipitation, high solar radiation receipt, and low air humidity, and has been affected by a severe drought since 2010. In this study, we suggest that most of the snowmelt runoff originates from specific areas with topographic and meteorological features that allow large snow accumulation and limited mass removal. To test this hypothesis, we quantify the spatial distribution of snowmelt runoff and sublimation in a catchment of the semiarid Andes using a process-based snow model that is forced with field data. Model simulations over a 2-year period reproduce point-scale records of snow depth (SD) and snow water equivalent (SWE) and are also in good agreement with an independent SWE reconstruction product as well as satellite snow cover area and indices of winter snow absence and summer snow persistence. We estimate that 50 % of snowmelt runoff is produced by 21 %–29 % of the catchment area, which we define as “snowmelt hotspots”. Snowmelt hotspots are located at mid-to-lower elevations of the catchment on wind-sheltered, low-angle slopes. Our findings show that sublimation is not only the main ablation component: it also plays an important role shaping the spatial variability in total annual snowmelt. Snowmelt hotspots might be connected with other hydrological features of arid and semiarid mountain regions, such as areas of groundwater recharge, rock glaciers, and mountain peatlands. We recommend more detailed snow and hydrological monitoring of these sites, especially in the current and projected scenarios of scarce precipitation.
摘要升华是半干旱安第斯山脉上层地区(~ 26 ~ ~ 32°S和~ 69 ~ ~ 71°W)积雪的主要消融成分。该地区海拔高达6000米,降水稀少,太阳辐射量大,空气湿度低,自2010年以来一直遭受严重干旱。在本研究中,我们认为大部分融雪径流来自具有地形和气象特征的特定地区,这些地区允许大量积雪和有限的质量去除。为了验证这一假设,我们使用基于过程的雪模型,利用野外数据,量化了半干旱安第斯山脉流域融雪径流和升华的空间分布。2年周期的模式模拟再现了雪深(SD)和雪水当量(SWE)的点尺度记录,并且与独立的SWE重建产品以及卫星积雪面积和冬季无雪和夏季积雪持续指数也很好地吻合。我们估计50%的融雪径流是由21% - 29%的集水区产生的,我们将其定义为“融雪热点”。融雪热点位于集水区的中低海拔、避风的低角度斜坡上。研究结果表明,升华不仅是主要的消融成分,而且在年融雪总量的空间变异性中起着重要作用。融雪热点可能与干旱和半干旱山区的其他水文特征有关,如地下水补给区、岩石冰川和山地泥炭地。我们建议对这些地点进行更详细的雪和水文监测,特别是在目前和预计的降水稀少的情况下。
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引用次数: 0
Technical note: Novel analytical solution for groundwater response to atmospheric tides 技术说明:地下水对大气潮汐响应的新解析解
1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2023-09-28 DOI: 10.5194/hess-27-3447-2023
Jose M. Bastias Espejo, Chris Turnadge, Russell S. Crosbie, Philipp Blum, Gabriel C. Rau
Abstract. Subsurface hydraulic and geomechanical properties can be estimated from well water level responses to Earth and atmospheric tides. However, the limited availability of analytical solutions restricts the applicability of this approach to realistic field conditions. We present a new and rigorous analytical solution for modeling flow between a subsurface–well system caused by harmonic atmospheric loading. We integrate this into a comprehensive workflow that also estimates subsurface properties using a well-established Earth tide method. When applied to groundwater monitoring datasets obtained from two boreholes screened in a sand aquifer in the Mary–Wildman river region (Northern Territory, Australia), estimated hydraulic conductivity and specific storage agree. Results also indicate that small vertical leakage occurs in the vicinity of both boreholes. Furthermore, the estimated geomechanical properties were within the values reported in the literature for similar lithological settings. Our new solution extends the capabilities of existing approaches, and our results demonstrate that analyzing the groundwater response to natural tidal forces is a low-cost and readily available solution for unconsolidated, hydraulically confined, and undrained subsurface conditions. This approach can support well-established characterization methods, increasing the amount of subsurface information.
摘要地下水力和地质力学性质可以通过井水水位对地球和大气潮汐的响应来估计。然而,分析解的有限可用性限制了这种方法在实际现场条件下的适用性。本文提出了一种新的、严格的大气谐波载荷下地下井间流动模型解析解。我们将其整合到一个全面的工作流程中,该工作流程还使用一种完善的地球潮汐方法来估计地下属性。当应用于从玛丽-怀尔德曼河地区(澳大利亚北部地区)的砂含水层中筛选的两个钻孔获得的地下水监测数据集时,估计的水力导电性和特定储水量一致。结果还表明,两个钻孔附近都发生了较小的垂直泄漏。此外,估计的地质力学性质在类似岩性环境下的文献报道值范围内。我们的新解决方案扩展了现有方法的能力,我们的结果表明,分析地下水对自然潮汐力的响应是一种低成本且易于使用的解决方案,适用于松散、水力限制和不排水的地下条件。这种方法可以支持成熟的表征方法,增加地下信息的数量。
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引用次数: 0
Drought intensity–duration–frequency curves based on deficit in precipitation and streamflow for water resources management 水资源管理中基于降水和流量亏缺的干旱强度-持续时间-频率曲线
1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2023-09-27 DOI: 10.5194/hess-27-3427-2023
Yonca Cavus, Kerstin Stahl, Hafzullah Aksoy
Abstract. Drought estimates in terms of physically measurable variables such as precipitation deficit or streamflow deficit are key knowledge for an effective water management. How these deficits vary with the drought event severity indicated by commonly used standardized indices is often unclear. Drought severity calculated from the drought index does not necessarily correspond to the same amount of deficit in precipitation or streamflow at different regions, and it is different for each month in the same region. We investigate drought to remove this disadvantage of the index-based drought intensity–duration–frequency (IDF) curves and develop IDF curves in terms of the associated deficit. In order to study the variation of deficits, we use the link between precipitation and streamflow and the associated indices, the Standardized Precipitation Index (SPI) and the Standardized Streamflow Index (SSI). More specifically, the analysis relies on frequency analysis combined with the total probability theorem applied to the critical drought severity. The critical drought has varying durations, and it is extracted from dry periods. IDF curves in terms of precipitation and streamflow deficits for the most severe drought of each drought duration in each year are then subject to comparison of statistical characteristics of droughts for different return periods. Precipitation and streamflow data from two catchments, the Seyhan River (Türkiye) and the Kocher River (Germany), provide examples for two climatically and hydrologically different cases. A comparison of the two cases allows a similar method to be tested in different hydrological conditions. We found that precipitation and streamflow deficits vary systematically, reflecting seasonality and the magnitude of precipitation and streamflow characteristics of the catchments. Deficits change from one month to another at a given station. Higher precipitation deficits were observed in winter months compared to summer months. Additionally, we assessed observed past major droughts experienced in both catchments on the IDF curves, which show that the major droughts have return periods at the order of 100 years at short durations. This coincides with the observation in the catchments and shows the applicability of the IDF curves. The IDF curves can be considered a tool for using in a range of specific activities of agriculture, ecology, industry, energy and water supply, etc. This is particularly important to end users and decision-makers to act against the drought quickly and precisely in a more physically understandable manner.
摘要根据降水亏缺或流量亏缺等物理可测量变量进行干旱估计是有效水资源管理的关键知识。这些赤字如何随常用的标准化指数所显示的干旱事件严重程度而变化,往往是不清楚的。根据干旱指数计算的干旱严重程度在不同地区并不一定对应相同的降水或流量亏缺量,在同一地区,每个月的亏缺量也不同。我们对干旱进行了研究,以消除基于指数的干旱强度-持续时间-频率(IDF)曲线的这一缺点,并根据相关赤字开发了IDF曲线。为了研究降水和流量之间的联系以及相关的指标,即标准化降水指数(SPI)和标准化流量指数(SSI)。更具体地说,分析依赖于频率分析与应用于临界干旱严重程度的总概率定理相结合。临界干旱有不同的持续时间,它是从干旱时期提取的。然后,根据每年每一干旱期间最严重干旱的降水和流量亏缺的IDF曲线,对不同回归期干旱的统计特征进行比较。来自两个集水区的降水和流量数据,即塞汉河(t rkiye)和Kocher河(德国),为两种气候和水文不同的情况提供了例子。对这两种情况进行比较,可以在不同的水文条件下测试类似的方法。研究发现,流域降水和流量亏缺具有系统的变化特征,反映了流域降水和流量的季节性特征。在一个给定的站点,每个月的赤字都在变化。与夏季相比,冬季降水亏缺较高。此外,我们在IDF曲线上评估了两个流域过去观测到的重大干旱,结果表明,重大干旱在短时间内具有100年左右的重现期。这与在集水区的观察结果相吻合,显示了IDF曲线的适用性。IDF曲线可被视为用于农业、生态、工业、能源和供水等一系列具体活动的工具。这对于最终用户和决策者以一种更容易理解的方式迅速和准确地采取抗旱行动尤为重要。
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引用次数: 1
Quantifying river water contributions to the transpiration of riparian trees along a losing river: lessons from stable isotopes and an iteration method 量化河流水对失去河流沿岸树木蒸腾的贡献:来自稳定同位素和迭代方法的经验教训
1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2023-09-26 DOI: 10.5194/hess-27-3405-2023
Yue Li, Ying Ma, Xianfang Song, Qian Zhang, Lixin Wang
Abstract. River water plays a critical role in riparian plant water use and riparian ecosystem restoration along losing rivers (i.e., river water recharging underlying groundwater). How to quantify the contributions of river water to the transpiration of riparian plants under different groundwater levels and the related responses of plant water use efficiency is a great challenge. In this study, observations of stable isotopes of water (δ2H and δ18O), 222Rn, and leaf δ13C were conducted for the deep-rooted riparian weeping willow (Salix babylonica L.) in 2019 (dry year) and 2021 (wet year) along the Chaobai River in Beijing, China. We proposed an iteration method in combination with the MixSIAR model to quantify the river water contribution to the transpiration of riparian S. babylonica and its correlations with the water table depth and leaf δ13C. Our results demonstrated that riparian S. babylonica took up deep water (in the 80–170 cm soil layer and groundwater) by 56.5 % ± 10.8 %. River water recharging riparian deep water was an indirect water source and contributed 20.3 % of water to the transpiration of riparian trees near the losing river. Significantly increasing river water uptake (by 7.0 %) and decreasing leaf δ13C (by −2.0 ‰) of riparian trees were observed as the water table depth changed from 2.7 m in the dry year of 2019 to 1.7 m in the wet year of 2021 (p<0.05). The higher water availability probably promoted stomatal opening and thus increased transpiration water loss, leading to the decreasing leaf δ13C in the wet year compared to the dry year. The river water contribution to the transpiration of riparian S. babylonica was found to be negatively linearly correlated with the water table depth and leaf δ13C (p<0.01). The rising groundwater level may increase the water extraction from the groundwater and/or river and produce a consumptive river-water-use pattern of riparian trees, which can have an adverse impact on the conservation of both river flow and riparian vegetation. This study provides new insights into understanding the mechanisms of the water cycle in a groundwater–soil–plant–atmosphere continuum and managing water resources and riparian afforestation along losing rivers.
摘要河流水在丧失河流的河岸植物用水和河岸生态系统恢复(即河流水补给地下地下水)中起着至关重要的作用。如何量化不同地下水位下河流水对河岸植物蒸腾的贡献以及植物水分利用效率的相关响应是一个巨大的挑战。本研究对北京潮白河流域深根滨水垂柳(Salix babylonica L.)在2019年(旱年)和2021年(丰水年)进行了水(δ2H和δ18O)、222Rn和叶片δ13C的稳定同位素观测。我们提出了一种结合MixSIAR模型的迭代方法,量化了河川水对巴比伦河蒿蒸腾的贡献及其与地下水位深度和叶片δ13C的相关性。结果表明,滨水巴比伦螺对深层(80 ~ 170 cm土层和地下水)的吸收量为56.5%±10.8%。补给河岸深水的河水为间接水源,对失去河流附近的河岸树木蒸腾贡献了20.3%的水分。当地下水位从2019年干旱年的2.7 m增加到2021年湿润年的1.7 m时,河岸树木的河流吸水量显著增加(7.0%),叶片δ13C显著降低(- 2.0‰)(p<0.05)。较高的水分有效度可能促进了气孔的开放,从而增加了蒸腾水分的损失,导致叶片δ13C在湿润年比干燥年降低。河水对河滨巴比伦杉蒸腾的贡献与地下水位深度和叶片δ13C呈负线性相关(p<0.01)。不断上升的地下水位可能会增加从地下水和/或河流中提取的水量,并产生一种消耗河岸树木的河流用水模式,这可能对河流流量和河岸植被的保护产生不利影响。该研究为理解地下水-土壤-植物-大气连续体中的水循环机制以及管理水资源和沿河流的河岸造林提供了新的见解。
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引用次数: 0
On the visual detection of non-natural records in streamflow time series: challenges and impacts 水流时间序列中非自然记录的视觉检测:挑战与影响
1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2023-09-22 DOI: 10.5194/hess-27-3375-2023
Laurent Strohmenger, Eric Sauquet, Claire Bernard, Jérémie Bonneau, Flora Branger, Amélie Bresson, Pierre Brigode, Rémy Buzier, Olivier Delaigue, Alexandre Devers, Guillaume Evin, Maïté Fournier, Shu-Chen Hsu, Sandra Lanini, Alban de Lavenne, Thibault Lemaitre-Basset, Claire Magand, Guilherme Mendoza Guimarães, Max Mentha, Simon Munier, Charles Perrin, Tristan Podechard, Léo Rouchy, Malak Sadki, Myriam Soutif-Bellenger, François Tilmant, Yves Tramblay, Anne-Lise Véron, Jean-Philippe Vidal, Guillaume Thirel
Abstract. Large datasets of long-term streamflow measurements are widely used to infer and model hydrological processes. However, streamflow measurements may suffer from what users can consider anomalies, i.e. non-natural records that may be erroneous streamflow values or anthropogenic influences that can lead to misinterpretation of actual hydrological processes. Since identifying anomalies is time consuming for humans, no study has investigated their proportion, temporal distribution, and influence on hydrological indicators over large datasets. This study summarizes the results of a large visual inspection campaign of 674 streamflow time series in France made by 43 evaluators, who were asked to identify anomalies falling under five categories, namely, linear interpolation, drops, noise, point anomalies, and other. We examined the evaluators' individual behaviour in terms of severity and agreement with other evaluators, as well as the temporal distributions of the anomalies and their influence on commonly used hydrological indicators. We found that inter-evaluator agreement was surprisingly low, with an average of 12 % of overlapping periods reported as anomalies. These anomalies were mostly identified as linear interpolation and noise, and they were more frequently reported during the low-flow periods in summer. The impact of cleaning data from the identified anomaly values was higher on low-flow indicators than on high-flow indicators, with change rates lower than 5 % most of the time. We conclude that the identification of anomalies in streamflow time series is highly dependent on the aims and skills of each evaluator, which raises questions about the best practices to adopt for data cleaning.
摘要长期流量测量的大型数据集被广泛用于推断和模拟水文过程。然而,流量测量可能会受到用户认为异常的影响,即可能是错误的流量值的非自然记录或可能导致对实际水文过程的错误解释的人为影响。由于识别异常对人类来说是耗时的,因此没有研究在大型数据集上调查异常的比例、时间分布以及对水文指标的影响。本研究总结了由43名评估者在法国对674个水流时间序列进行的大型目视检查活动的结果,他们被要求识别五类异常,即线性插值、下降、噪声、点异常等。我们从严重程度和与其他评估人员的一致性方面检查了评估人员的个人行为,以及异常的时间分布及其对常用水文指标的影响。我们发现评估者之间的一致性出奇地低,平均有12%的重叠期被报告为异常。这些异常以线性插值和噪声为主,在夏季低流期更为常见。来自已识别异常值的清洗数据对低流量指标的影响大于对高流量指标的影响,大多数时间的变化率低于5%。我们得出的结论是,流时间序列中异常的识别高度依赖于每个评估者的目标和技能,这就提出了关于采用数据清理的最佳实践的问题。
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引用次数: 0
Dye-tracer-aided investigation of xylem water transport velocity distributions 染料示踪剂辅助木质部输水速度分布的研究
1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Pub Date : 2023-09-22 DOI: 10.5194/hess-27-3393-2023
Stefan Seeger, Markus Weiler
Abstract. The vast majority of studies investigating the source depths in the soil of root water uptake with the help of stable water isotopes implicitly assumes that the isotopic signatures of root water uptake and xylem water are identical. In this study we show that this basic assumption is not necessarily valid, since water transport within a plant's xylem is not instantaneous. However, to our knowledge, no study has yet tried to explicitly assess the distribution of water transport velocities within the xylem. With a dye tracer experiment, we were able to visualize how the transport of water through the xylem happens at a wide range of velocities which are distributed unequally throughout the xylem. In an additional virtual experiment we could show that, due to the unequal distribution of transport velocities throughout the xylem, different sampling approaches of stable water isotopes might effectively lead to xylem water samples with different underlying age distributions.
摘要绝大多数利用稳定水同位素研究土壤中根系水分吸收源深度的研究隐含地假设了根系水分吸收和木质部水分的同位素特征是相同的。在这项研究中,我们表明这一基本假设并不一定有效,因为植物木质部内的水运输不是瞬时的。然而,据我们所知,还没有研究试图明确评估木质部内水输送速度的分布。通过染料示踪实验,我们能够直观地看到水在木质部中的运输是如何在很大范围内发生的,这些速度在木质部中的分布是不均匀的。在另一个虚拟实验中,我们可以证明,由于整个木质部的传输速度分布不均匀,不同的稳定水同位素采样方法可能有效地导致木质部水样具有不同的底层年龄分布。
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引用次数: 0
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Hydrology and Earth System Sciences
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