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Features of the Distribution of Beaver Dams and Ponds along Small Rivers: The Volga-Kama Region, European Russia 小河沿岸海狸坝和池塘的分布特点:俄罗斯欧洲伏尔加河-卡马河地区
Pub Date : 2024-04-09 DOI: 10.3390/hydrology11040053
A. Gusarov, A. Sharifullin, A. Beylich, Fedor N. Lisetskii
In this paper, by using GNSS technologies, some features of the distribution and some morphometric parameters of dams and ponds created by the Eurasian beaver (Castor fiber L.) along ten rivers of the Volga-Kama region of European Russia were identified. Detected features depend on the geomorphological, lithological, and landscape features of these rivers and their basins. The significant role of river slopes, as well as landscape zoning, in the distribution of beaver dams and ponds along small rivers in the study region is shown. In the rivers under study, almost all beaver constructions are located on riverbed slopes of less than 3% (most often, less than 2%). In the south of the forest zone (the southern taiga of the Vyatka River basin), the majority of dams and ponds (about 90%) are located on slopes of less than 1%, while, within the uplands of the forest-steppe zone, this location varies depending on the length of the rivers. In general, the greater the average slope of the river (the greater the average elevation of the river basin), the lower, other things being equal, the degree of beaver transformation of such rivers. This feature is better expressed in the rivers of the forest landscape zone and less expressed in the rivers flowing in the forest-steppe zone. Analysis of the morphometric parameters of beaver dams shows statistically significant trends towards an increase in their average height, as the channel slopes increase. Statistically significant trends were also identified towards a decrease in the length of dams and the length of associated ponds, with an increase in channel slopes. It is noteworthy that the critical values of the slope for a statistically significant and relatively sharp change in these parameters are 1.45%, 1.07 (or 0.54)%, and 0.65 (or 0.47)%, respectively. The greatest average heights of beaver dams are confined to those rivers where their basins are composed of loamy rocks/soils (especially those that are poorly plowed), compared with “sandy” river basins. This may be due to the peculiarities of the ratio of surface and underground water runoff in these basins and, as a consequence, different intensities of snowmelt- and rainfall-induced flood flow. We assume that the above-mentioned features reflect the early stages of beaver expansion (population growth) in the studied rivers.
本文利用全球导航卫星系统技术,确定了欧亚河狸(Castor fiber L.)在俄罗斯欧洲伏尔加-卡马地区十条河流沿岸所建水坝和池塘的分布特征和一些形态计量参数。探测到的特征取决于这些河流及其流域的地貌、岩性和景观特征。河坡以及地貌分区在研究地区小河沿岸海狸坝和池塘的分布中起着重要作用。在所研究的河流中,几乎所有的海狸坝都位于河床坡度小于 3% 的地方(最常见的是小于 2%)。在森林区南部(维亚特卡河流域的南部泰加林区),大多数水坝和池塘(约 90%)都位于坡度小于 1%的斜坡上,而在森林草原区的高地上,坡度因河流长度而异。一般来说,在其他条件相同的情况下,河流的平均坡度越大(流域的平均海拔越高),海狸对这些河流的改造程度就越低。这一特征在森林景观带的河流中表现得更为明显,而在流经森林草原地带的河流中则表现得较少。对海狸坝形态参数的分析表明,随着河道坡度的增加,海狸坝的平均高度也呈显著增加趋势。此外,随着河道坡度的增加,海狸坝的长度和相关池塘的长度也呈明显的减少趋势。值得注意的是,这些参数在统计意义上发生显著和相对急剧变化的坡度临界值分别为 1.45%、1.07(或 0.54)% 和 0.65(或 0.47)%。与 "沙质 "河流流域相比,海狸坝的最大平均高度仅限于那些流域由黄土岩石/土壤(尤其是那些耕作条件较差的河流)构成的河流。这可能是由于这些流域地表水和地下水径流比例的特殊性,以及由融雪和降雨引起的洪水流量强度的不同。我们认为,上述特征反映了海狸在所研究河流中扩张(数量增长)的早期阶段。
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引用次数: 0
A Spatiotemporal Assessment of the Precipitation Variability and Pattern, and an Evaluation of the Predictive Reliability, of Global Climate Models over Bihar 对比哈尔邦降水变异性和模式的时空评估以及对全球气候模型预测可靠性的评价
Pub Date : 2024-04-08 DOI: 10.3390/hydrology11040050
Ahmad Rashiq, Vishwajeet Kumar, Om Prakash
Climate change is significantly altering precipitation patterns, leading to spatiotemporal changes throughout the world. In particular, the increased frequency and intensity of extreme weather events, leading to heavy rainfall, floods, and droughts, have been a cause of concern. A comprehensive understanding of these changes in precipitation patterns on a regional scale is essential to enhance resilience against the adverse effects of climate change. The present study, focused on the state of Bihar in India, uses a long-term (1901–2020) gridded precipitation dataset to analyze the effect of climate change. Change point detection tests divide the time series into two epochs: 1901–1960 and 1961–2020, with 1960 as the change point year. Modified Mann–Kendall (MMK) and Sen’s slope estimator tests are used to identify trends in seasonal and annual time scales, while Centroidal Day (CD) analysis is performed to determine changes in temporal patterns of rainfall. The results show significant variability in seasonal rainfall, with the nature of pre-monsoon and post-monsoon observed to have flipped in second epoch. The daily rainfall intensity during the monsoon season has increased considerably, particularly in north Bihar, while the extreme rainfall has increased by 60.6 mm/day in the second epoch. The surface runoff increased by approximately 13.43% from 2001 to 2020. Further, 13 Global Climate Models (GCMs) evaluate future scenarios based on Shared Socioeconomic Pathways (SSP) 370 and SSP585. The suitability analysis of these GCMs, based on probability density function (PDF), monthly mean absolute error (MAE), root mean square error (RMSE) and percentage bias (P-Bias), suggests that EC-Earth3-Veg-LR, MIROC6, and MPI-ESM1-2-LR are the three best GCMs representative of rainfall in Bihar. A Bayesian model-averaged (BMA) multi-model ensemble reflects the variability expected in the future with the least uncertainty. The present study’s findings clarify the current state of variability, patterns and trends in precipitation, while suggesting the most appropriate GCMs for better decision-making and preparedness.
气候变化正在极大地改变降水模式,导致世界各地的时空变化。特别是,导致暴雨、洪水和干旱的极端天气事件的频率和强度增加,已引起人们的关注。全面了解区域范围内降水模式的这些变化,对于增强抵御气候变化不利影响的能力至关重要。本研究以印度比哈尔邦为重点,利用长期(1901-2020 年)网格降水数据集分析气候变化的影响。变化点检测测试将时间序列分为两个年代:1901-1960 年和 1961-2020 年,其中 1960 年为变化点年。使用修正的曼-肯德尔(MMK)和森氏斜率估计器检验来确定季节和年度时间尺度的趋势,同时进行中心日(CD)分析来确定降雨时间模式的变化。结果显示,季节性降雨量变化很大,季风前和季风后的性质在第二个纪元发生了翻转。季风季节的日降雨量显著增加,尤其是在比哈尔邦北部,而极端降雨量在第二个纪元增加了 60.6 毫米/天。从 2001 年到 2020 年,地表径流增加了约 13.43%。此外,13 个全球气候模型 (GCM) 根据共享社会经济路径 (SSP) 370 和 SSP585 对未来情景进行了评估。根据概率密度函数 (PDF)、月平均绝对误差 (MAE)、均方根误差 (RMSE) 和偏差百分比 (P-Bias),对这些 GCM 进行了适用性分析,结果表明 EC-Earth3-Veg-LR、MIROC6 和 MPI-ESM1-2-LR 是最能代表比哈尔邦降雨量的三个 GCM。贝叶斯模型平均 (BMA) 多模型集合以最小的不确定性反映了未来的预期变化。本研究的结果澄清了降水的变异性、模式和趋势的现状,同时提出了最合适的全球气候模型,以更好地进行决策和准备。
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引用次数: 0
Integrated Hydrological and Hydrochemical Analysis of Arsenic and Iron Behavior in Waters of a Decommissioned Tin Mine in Ehrenfriedersdorf, Germany 德国 Ehrenfriedersdorf 退役锡矿水体中砷和铁行为的综合水文和水化学分析
Pub Date : 2024-04-08 DOI: 10.3390/hydrology11040051
Viktoria Rafique, M. Grimmer, Florian Scheermann, Marco Roscher, Nils Hoth
Arsenic contamination poses significant challenges to environmental and public health, with mining activities contributing to its wider distribution. This study investigates the fate of arsenic and iron in mine waters at a decommissioned tin mine, now a visitor mine, located in Ehrenfriedersdorf, Germany, situated in the Free State of Saxony. Despite the general shortage of data, which is common for old mining sites, we explored the complex interplay of climatic conditions, hydrological processes, and arsenic and iron behavior in the mine waters through a comprehensive approach encompassing general site characterization, mine water monitoring, and analysis of local weather data. Over a period of three years, we conducted 14 sampling campaigns, collecting a total of 95 water samples, each consisting of three filtration subsamples, resulting in the analysis of 285 water samples. These samples were collected both aboveground and underground. Aboveground samples included mine outflows, a tailing outflow, and an adjacent creek, while underground sampling points were scattered throughout the mine initially and later focused on the identified “main” mine water system. The chemical data from the analyses were correlated with local climatic water balances to reveal distinctive patterns in arsenic and iron concentrations at various locations within the mine system. Our findings shed light on the hydrological behavior of the mine, helping to elucidate the impact of precipitation and potential evapotranspiration on arsenic and iron concentrations in a tailing outflow, in the flooded mine body, and at the portal of the main dewatering gallery. Our findings emphasize the importance of sustained monitoring and the utilization of local weather data to comprehend metalloid and metal contamination risks in similar mining environments.
砷污染对环境和公众健康构成了重大挑战,而采矿活动则加剧了砷的广泛分布。本研究调查了位于德国萨克森自由州 Ehrenfriedersdorf 的一个退役锡矿(现为游客矿)矿井水中砷和铁的去向。尽管数据匮乏是老矿区的普遍现象,但我们还是通过包括矿区总体特征描述、矿井水监测和当地气象数据分析在内的综合方法,探索了气候条件、水文过程以及矿井水中砷和铁行为之间复杂的相互作用。在三年的时间里,我们进行了 14 次采样活动,共采集了 95 个水样,每个水样由三个过滤子样组成,共分析了 285 个水样。这些样本是在地面和地下采集的。地面样本包括矿井流出物、尾矿流出物和邻近的一条小溪,而地下取样点最初分散在整个矿区,后来集中在已确定的 "主要 "矿井水系统。分析得出的化学数据与当地气候水量平衡相关联,揭示了矿井系统内不同地点砷和铁浓度的独特模式。我们的研究结果揭示了矿山的水文行为,有助于阐明降水和潜在蒸散作用对尾矿流出、淹没矿体和主排水廊道入口处砷和铁浓度的影响。我们的研究结果强调了持续监测和利用当地气象数据来了解类似采矿环境中类金属和金属污染风险的重要性。
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引用次数: 0
Climatic Modeling of Seawater Intrusion in Coastal Aquifers: Understanding the Climate Change Impacts 沿海含水层海水入侵气候模型:了解气候变化的影响
Pub Date : 2024-04-06 DOI: 10.3390/hydrology11040049
A. Lyra, A. Loukas, P. Sidiropoulos, N. Mylopoulos
The study examines the impacts of climate change and sea level rise on coastal aquifers, focusing on the influence of the components of the water cycle on seawater intrusion, and the evolution of the phenomenon in the future. The simulation of coastal water resources was performed using an integrated modeling system (IMS), designed for agricultural coastal watersheds, which consists of inter-connected models of surface hydrology (UTHBAL), groundwater hydrology (MODFLOW), and seawater intrusion (SEAWAT). Climatic models for the adverse impact scenario (RCP8.5) and the medium impact scenario (RCP4.5) of climate change were used. Transient boundary head conditions were set to the coastal boundary, to dynamically represent the rise in sea level due to climate change. The response of groundwater in the coastal Almyros Basin, located in central Greece, was simulated from 1991 to 2100. The findings indicate that seawater intrusion will be advanced in the future, in both climate change scenarios. The models show varying patterns in groundwater recharge, with varying uncertainty projected into the future, and sensitivity to time in the fluctuation of the components of the water cycle.
这项研究探讨了气候变化和海平面上升对沿海含水层的影响,重点是水循环各组成 部分对海水入侵的影响以及这种现象在未来的演变。对沿海水资源的模拟采用了专为沿海农业流域设计的综合建模系统(IMS),该系统 由相互连接的地表水文模型(UTHBAL)、地下水文模型(MODFLOW)和海水入侵模型 (SEAWAT)组成。采用了不利影响情景(RCP8.5)和中等影响情景(RCP4.5)的气候变化模型。在沿岸边界设置了瞬态边界水头条件,以动态表示气候变化引起的海平面上升。模拟了希腊中部沿海阿尔米罗斯盆地地下水从 1991 年到 2100 年的变化情况。研究结果表明,在两种气候变化情况下,海水入侵在未来都将加剧。模型显示了地下水补给的不同模式,对未来的预测具有不同的不确定性,以及水循环组成部分的波动对时间的敏感性。
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引用次数: 0
Utilizing Hybrid Machine Learning Techniques and Gridded Precipitation Data for Advanced Discharge Simulation in Under-Monitored River Basins 利用混合机器学习技术和网格降水数据对监测不足的河流流域进行高级排水模拟
Pub Date : 2024-04-04 DOI: 10.3390/hydrology11040048
Reza Morovati, Ozgur Kisi
This study addresses the challenge of utilizing incomplete long-term discharge data when using gridded precipitation datasets and data-driven modeling in Iran’s Karkheh basin. The Multilayer Perceptron Neural Network (MLPNN), a rainfall-runoff (R-R) model, was applied, leveraging precipitation data from the Asian Precipitation—Highly Resolved Observational Data Integration Toward Evaluation (APHRODITE), Global Precipitation Climatology Center (GPCC), and Climatic Research Unit (CRU). The MLPNN was trained using the Levenberg–Marquardt algorithm and optimized with the Non-dominated Sorting Genetic Algorithm-II (NSGA-II). Input data were pre-processed through principal component analysis (PCA) and singular value decomposition (SVD). This study explored two scenarios: Scenario 1 (S1) used in situ data for calibration and gridded dataset data for testing, while Scenario 2 (S2) involved separate calibrations and tests for each dataset. The findings reveal that APHRODITE outperformed in S1, with all datasets showing improved results in S2. The best results were achieved with hybrid applications of the S2-PCA-NSGA-II for APHRODITE and S2-SVD-NSGA-II for GPCC and CRU. This study concludes that gridded precipitation datasets, when properly calibrated, significantly enhance runoff simulation accuracy, highlighting the importance of bias correction in rainfall-runoff modeling. It is important to emphasize that this modeling approach may not be suitable in situations where a catchment is undergoing significant changes, whether due to development interventions or the impacts of anthropogenic climate change. This limitation highlights the need for dynamic modeling approaches that can adapt to changing catchment conditions.
本研究解决了在伊朗卡尔赫流域使用网格降水数据集和数据驱动建模时利用不完整的长期排水数据所面临的挑战。利用亚洲降水-高分辨率观测数据整合评估(APHRODITE)、全球降水气候学中心(GPCC)和气候研究单位(CRU)的降水数据,应用了多层感知器神经网络(MLPNN)这一降雨-径流(R-R)模型。MLPNN 使用 Levenberg-Marquardt 算法进行训练,并使用非优势排序遗传算法-II(NSGA-II)进行优化。输入数据通过主成分分析(PCA)和奇异值分解(SVD)进行了预处理。本研究探讨了两种方案:方案 1(S1)使用原位数据进行校准,网格数据集数据进行测试,而方案 2(S2)则对每个数据集分别进行校准和测试。研究结果表明,APHRODITE 在 S1 中表现优异,而在 S2 中,所有数据集的结果都有所改善。APHRODITE 的 S2-PCA-NSGA-II 和 GPCC 和 CRU 的 S2-SVD-NSGA-II 混合应用取得了最佳结果。本研究的结论是,网格降水数据集经适当校准后,可显著提高径流模拟精度,突出了降雨-径流建模中偏差校正的重要性。需要强调的是,这种建模方法可能不适用于因开发干预或人为气候变化影响而导致集水区发生重大变化的情况。这种局限性突出表明,需要能够适应不断变化的流域条件的动态建模方法。
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引用次数: 0
Hydrogeological Characteristics of the Makaresh Carbonate Karst Massif (Central Albania) 马卡雷什碳酸盐岩喀斯特山丘(阿尔巴尼亚中部)的水文地质特征
Pub Date : 2024-02-15 DOI: 10.3390/hydrology11020029
Romeo Eftimi, I. S. Liso, Mario Parise
Carbonate rocks cover about 23% of Albania, with exploitable karst water resources estimated at 2.84 × 109 m3/year (about 65% of the total exploitable groundwater resources in the country). The Kruja tectonic zone is characterized by the presence of SE–NW-oriented carbonate structures, rich in fresh and thermal groundwaters. More than 80% of the thermal springs in Albania are present in this tectonic zone. One of its most interesting carbonate structures, with the presence of both cold and thermal waters, is the small karst structure of Makaresh, with a surface of 22 km2. The purpose of this article is to describe the hydrogeological characteristics of this massif; based on the physico-chemical characteristics, groundwaters of the study area are classified as cold waters (belonging to the local flow system) and thermal waters (originating in intermediate/deep flow systems). The former are mainly of HCO3-Ca or HCO3-Ca-Mg type (electrical conductivity 580–650 μS/cm, Temperature 13.9–16.6 °C). Thermal waters are mainly of the Cl-Na-Ca type (EC 7200–7800 μS/cm, T 18.5–22.5 °C); they are further characterized by high hydrogen sulfide concentration, up to about 350 mg/L. The presence of two groundwater types in the Makaresh massif is connected to the presence of two groundwater circulation systems. The main factors of the groundwater physico-chemical quality are the dissolution of rocks and minerals contained therein, the presence of hypogenic speleogenesis, and the mixing of the groundwater of the two systems. The hydrogeological studies proved that karst rocks contain considerable freshwater resources, partly used for water supply. Thermal waters are not currently exploited due to their temperature, but they are potentially suitable for thermal uses by drilling boreholes to a depth of about 1000 m.
碳酸盐岩约占阿尔巴尼亚国土面积的 23%,可开采的岩溶水资源估计为 2.84 × 109 立方米/年(约占该国可开采地下水资源总量的 65%)。克鲁亚构造区的特点是存在东南-西北走向的碳酸盐结构,蕴藏着丰富的淡水和热地下水。阿尔巴尼亚 80% 以上的温泉都位于该构造带。马卡雷什(Makaresh)小型岩溶结构是最有趣的碳酸盐结构之一,既有冷水,也有热水,面积达 22 平方公里。本文的目的是描述该岩溶地貌的水文地质特征;根据物理化学特征,研究区域的地下水可分为冷水(属于当地水流系统)和热水(源自中层/深层水流系统)。冷水主要属于 HCO3-Ca 或 HCO3-Ca-Mg 类型(电导率 580-650 μS/cm,温度 13.9-16.6 °C)。温泉水主要属于 Cl-Na-Ca 型(导电率 7200-7800 μS/cm,温度 18.5-22.5 °C);其特点是硫化氢浓度高,最高可达约 350 毫克/升。马卡雷什山丘有两种地下水类型,这与两个地下水循环系统有关。影响地下水物理化学质量的主要因素是其中所含岩石和矿物质的溶解、低成因溶洞的存在以及两个系统地下水的混合。水文地质研究证明,岩溶岩石中含有大量淡水资源,部分用于供水。由于温度的原因,目前还没有开发利用热能水,但通过钻探约 1000 米深的井眼,有可能将其用于热能用途。
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引用次数: 0
Hydrogeological Characteristics of the Makaresh Carbonate Karst Massif (Central Albania) 马卡雷什碳酸盐岩喀斯特山丘(阿尔巴尼亚中部)的水文地质特征
Pub Date : 2024-02-15 DOI: 10.3390/hydrology11020029
Romeo Eftimi, I. S. Liso, Mario Parise
Carbonate rocks cover about 23% of Albania, with exploitable karst water resources estimated at 2.84 × 109 m3/year (about 65% of the total exploitable groundwater resources in the country). The Kruja tectonic zone is characterized by the presence of SE–NW-oriented carbonate structures, rich in fresh and thermal groundwaters. More than 80% of the thermal springs in Albania are present in this tectonic zone. One of its most interesting carbonate structures, with the presence of both cold and thermal waters, is the small karst structure of Makaresh, with a surface of 22 km2. The purpose of this article is to describe the hydrogeological characteristics of this massif; based on the physico-chemical characteristics, groundwaters of the study area are classified as cold waters (belonging to the local flow system) and thermal waters (originating in intermediate/deep flow systems). The former are mainly of HCO3-Ca or HCO3-Ca-Mg type (electrical conductivity 580–650 μS/cm, Temperature 13.9–16.6 °C). Thermal waters are mainly of the Cl-Na-Ca type (EC 7200–7800 μS/cm, T 18.5–22.5 °C); they are further characterized by high hydrogen sulfide concentration, up to about 350 mg/L. The presence of two groundwater types in the Makaresh massif is connected to the presence of two groundwater circulation systems. The main factors of the groundwater physico-chemical quality are the dissolution of rocks and minerals contained therein, the presence of hypogenic speleogenesis, and the mixing of the groundwater of the two systems. The hydrogeological studies proved that karst rocks contain considerable freshwater resources, partly used for water supply. Thermal waters are not currently exploited due to their temperature, but they are potentially suitable for thermal uses by drilling boreholes to a depth of about 1000 m.
碳酸盐岩约占阿尔巴尼亚国土面积的 23%,可开采的岩溶水资源估计为 2.84 × 109 立方米/年(约占该国可开采地下水资源总量的 65%)。克鲁亚构造区的特点是存在东南-西北走向的碳酸盐结构,蕴藏着丰富的淡水和热地下水。阿尔巴尼亚 80% 以上的温泉都位于该构造带。马卡雷什(Makaresh)小型岩溶结构是最有趣的碳酸盐结构之一,既有冷水,也有热水,面积达 22 平方公里。本文的目的是描述该岩溶地貌的水文地质特征;根据物理化学特征,研究区域的地下水可分为冷水(属于当地水流系统)和热水(源自中层/深层水流系统)。冷水主要属于 HCO3-Ca 或 HCO3-Ca-Mg 类型(电导率 580-650 μS/cm,温度 13.9-16.6 °C)。温泉水主要属于 Cl-Na-Ca 型(导电率 7200-7800 μS/cm,温度 18.5-22.5 °C);其特点是硫化氢浓度高,最高可达约 350 毫克/升。马卡雷什山丘有两种地下水类型,这与两个地下水循环系统有关。影响地下水物理化学质量的主要因素是其中所含岩石和矿物质的溶解、低成因溶洞的存在以及两个系统地下水的混合。水文地质研究证明,岩溶岩石中含有大量淡水资源,部分用于供水。由于温度的原因,目前还没有开发利用热能水,但通过钻探约 1000 米深的井眼,有可能将其用于热能用途。
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引用次数: 0
Sensitivity of Groundwater Recharge Assessment to Input Data in Arid Areas 干旱地区地下水补给评估对输入数据的敏感性
Pub Date : 2024-02-14 DOI: 10.3390/hydrology11020028
S. Ajjur, Emanuele Di Lorenzo
Natural groundwater recharge (GR) assessment depends on several hydrogeological and climatic inputs, where uncertainty is inevitable. Assessing how inputs’ uncertainty affects GR estimation is important; however, it remains unclear in arid areas. This study assesses inputs’ uncertainty by examining the changes in GR simulations resulting from modifications in climatic, land use, and soil inputs. A physical-based hydrological model was built to estimate GR from 18 different GR scenarios across Qatar. Scenarios S1–S7 were created from different climatic inputs but identical land use and soil maps. Scenarios S8–S14 were created from different land use maps (analyzed from historical Landsat satellite images) but similar climatic and soil inputs. In S15–S18, the soil parameters were changed while the climatic and land use maps were kept the same. The results show that climatic inputs are key factors controlling the GR in arid areas, followed by land use inputs and soil classification. A strong correlation was observed between the GR values and precipitation, while moderate (non-significant) correlations were observed between the GR values and potential evapotranspiration and wind speed. Soil changes affected the GR simulations but inconsiderably compared with climatic and land use inputs. Since GR estimation is fundamental but uncertain in arid areas, the study findings contribute to narrowing the uncertainty in GR estimation.
天然地下水补给(GR)评估取决于若干水文地质和气候输入,其中不确定性不可避免。评估输入的不确定性如何影响地下水补给估算非常重要,但在干旱地区仍不明确。本研究通过考察气候、土地利用和土壤输入的变化对 GR 模拟的影响来评估输入的不确定性。建立了一个基于物理的水文模型,以估算卡塔尔 18 种不同的 GR 情景下的 GR 值。情景 S1-S7 根据不同的气候输入创建,但土地利用和土壤地图相同。情景 S8-S14 是根据不同的土地利用图(通过历史大地遥感卫星图像分析)创建的,但气候和土壤输入相似。在 S15-S18 中,土壤参数发生了变化,但气候和土地利用图保持不变。结果表明,气候输入是控制干旱地区 GR 的关键因素,其次是土地利用输入和土壤分类。GR 值与降水量之间存在很强的相关性,而 GR 值与潜在蒸散量和风速之间存在中等程度(不显著)的相关性。土壤变化对 GR 模拟产生了影响,但与气候和土地利用输入相比影响不大。由于干旱地区的全球平均降水量估算非常重要,但也存在不确定性,因此研究结果有助于缩小全球平均降水量估算的不确定性。
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引用次数: 0
Long-Term Spatiotemporal Investigation of Various Rainfall Intensities over Central India Using EO Datasets 利用 EO 数据集对印度中部各种降雨强度进行长期时空调查
Pub Date : 2024-02-13 DOI: 10.3390/hydrology11020027
Nitesh Awasthi, J. N. Tripathi, G. Petropoulos, Pradeep Kumar, A. Singh, K. Dakhore, Kripan Ghosh, Dileep Kumar Gupta, P. Srivastava, K. Kalogeropoulos, Sartajvir Singh, Dhiraj Kumar Singh
This study involved an investigation of the long-term seasonal rainfall patterns in central India at the district level during the period from 1991 to 2020, including various aspects such as the spatiotemporal seasonal trend of rainfall patterns, rainfall variability, trends of rainy days with different intensities, decadal percentage deviation in long-term rainfall patterns, and decadal percentage deviation in rainfall events along with their respective intensities. The central region of India was meticulously divided into distinct subparts, namely, Gujarat, Daman and Diu, Maharashtra, Goa, Dadra and Nagar Haveli, Madhya Pradesh, Chhattisgarh, and Odisha. The experimental outcomes represented the disparities in rainfall distribution across different districts of central India with the spatial distribution of mean rainfall ranges during winter (2.08 mm over Dadra and Nagar Haveli with an average of 24.19 mm over Odisha), premonsoon (6.65 mm over Gujarat to 132.89 mm over Odisha), monsoon (845.46 mm over Gujarat to 3188.21 mm over Goa), and post-monsoon (30.35 mm over Gujarat to 213.87 mm over Goa), respectively. Almost all the districts of central India displayed an uneven pattern in the percentage deviation of seasonal rainfall in all three decades for all seasons, which indicates the seasonal rainfall variability over the last 30 years. A noticeable variation in the percentage deviation of seasonal rainfall patterns has been observed in the following districts: Rewa, Puri, Anuppur, Ahmadabad, Navsari, Chhindwara, Devbhumi Dwarka, Amreli, Panch Mahals, Kolhapur, Kandhamal, Ratnagiri, Porbandar, Bametara, and Sabar Kantha. In addition, a larger number of rainy days of various categories occurred in the monsoon season in comparison to other seasons. A higher contribution of trace rainfall events was found in the winter season. The highest contributions of very light, light rainfall, moderate, rather high, and high events were found in the monsoon season in central India. The percentage of various categories of rainfall events has decreased over the last two decades (2001–2020) in comparison to the third decade (1991–2000), according to the mean number of rainfall events in the last 30 years. This spatiotemporal analysis provides valuable insights into the rainfall trends in central India, which represent regional disparities and the potential challenges impacted by climate patterns. This study contributes to our understanding of the changing rainfall dynamics and offers crucial information for effective water resource management in the region.
本研究对 1991 年至 2020 年期间印度中部地区县一级的长期季节性降雨模式进行了调查,包括降雨模式的时空季节性趋势、降雨变异性、不同强度降雨日的趋势、长期降雨模式的十年百分比偏差、降雨事件及其各自强度的十年百分比偏差等各个方面。印度中部地区被细致地划分为不同的分区,即古吉拉特邦、达曼和迪乌邦、马哈拉施特拉邦、果阿邦、达德拉和纳加尔哈维利邦、中央邦、恰蒂斯加尔邦和奥迪沙邦。19 毫米)、季风前(古吉拉特邦为 6.65 毫米,奥迪沙邦为 132.89 毫米)、季风(古吉拉特邦为 845.46 毫米,果阿邦为 3188.21 毫米)和季风后(古吉拉特邦为 30.35 毫米,果阿邦为 213.87 毫米)。印度中部几乎所有地区在所有三个十年中所有季节的季节性降雨百分比偏差都显示出不均衡的模式,这表明了过去 30 年中季节性降雨的多变性。下列地区的季节性降雨偏差百分比模式出现了明显的变化:Rewa、Puri、Anuppur、Ahmadabad、Navsari、Chhindwara、Devbhumi Dwarka、Amreli、Panch Mahals、Kolhapur、Kandhamal、Ratnagiri、Porbandar、Bametara 和 Sabar Kantha。此外,与其他季节相比,季风季节的各类降雨日数更多。冬季的微量降雨日数较多。印度中部的季风季节降雨量最大的是微雨、小雨、中雨、大雨和暴雨。根据过去 30 年降雨事件的平均数量,与第三个十年(1991-2000 年)相比,过去二十年(2001-2020 年)各类降雨事件的比例有所下降。这项时空分析为了解印度中部的降雨趋势提供了宝贵的信息,这些趋势代表了地区差异以及受气候模式影响的潜在挑战。这项研究有助于我们了解不断变化的降雨动态,并为该地区有效的水资源管理提供了重要信息。
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引用次数: 0
Increased Hg Methylation Risks in Management-Induced Terrain Depressions in Forests with Organic-Matter-Rich Soils 在富含有机物质土壤的森林中,管理引起的地形凹陷增加了汞甲基化风险
Pub Date : 2024-02-13 DOI: 10.3390/hydrology11020026
Ivars Kļaviņš, A. Bārdule, Zane Kļaviņa, Z. Lībiete
Mercury (Hg) is a toxic contaminant that bioaccumulates in trophic chains in its organic form—methylmercury (MeHg). Hg methylation is driven by microorganisms in favourable conditions, stagnant water pools being among potential methylation hotspots. In the present study, we estimated the total Hg and MeHg concentrations in the sediments of water-filled management-induced terrain depressions (ruts, mounding pits and a partly functional drainage ditch) and in nearby undisturbed soil in six hemiboreal forest sites with organic-matter-rich soils in Latvia. Environmental samples were taken in the spring, summer and autumn of 2022. Furthermore, we evaluated the risks of element leaching from the depressions using high-resolution digital terrain models (DTM) and meteorological data. The results suggested a possible leaching of Hg in the past as THg concentrations in the sediments of the depressions were significantly lower than in the surrounding soil. Furthermore, significantly higher MeHg and %MeHg concentrations were found in the sediments than in the surrounding soil identifying the management-induced depressions as Hg methylation hotspots. Spatial analysis of the DTMs pointed to a very likely periodical leaching of elements from the depressions during high precipitation episodes as well as during snowmelts. Moreover, it was observed that ruts left by heavy machinery often channel surface runoff.
汞(Hg)是一种有毒污染物,会以有机形式--甲基汞(MeHg)在营养链中进行生物累积。汞的甲基化是由微生物在有利条件下驱动的,死水池是潜在的甲基化热点。在本研究中,我们估算了拉脱维亚六个富含有机物质土壤的半山森林地点中,由管理引起的地形洼地(车辙、土墩坑和部分功能的排水沟)中的沉积物以及附近未受扰动土壤中的总汞和甲基汞浓度。环境样本于 2022 年春、夏、秋三季采集。此外,我们还利用高分辨率数字地形模型 (DTM) 和气象数据评估了洼地元素沥滤的风险。结果表明,过去可能存在汞沥滤现象,因为洼地沉积物中的三卤甲烷浓度明显低于周围土壤中的浓度。此外,沉积物中的甲基汞(MeHg)和甲基汞(MeHg)浓度明显高于周围土壤中的浓度,这表明管理引起的洼地是汞甲基化的热点地区。对 DTM 的空间分析表明,在降水量大和融雪期间,洼地中的元素很可能会周期性沥滤。此外,还观察到重型机械留下的车辙经常会引导地表径流。
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Hydrology
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