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Effects of sample preparation methods on measured characteristics of marine and fluvial sediment 样品制备方法对海洋和河流沉积物测量特征的影响
IF 3.6 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2024-02-01 DOI: 10.1016/j.ijsrc.2023.09.002
Rachid Zentar , Fatima Ouendi , Hongwei Wang

Dredged sediment is complex material composed of mineral phases, organics phases, and liquid phases. For the characterization of sediment in the laboratory, the material should be dried before applying some tests, such as the determination of organic matter content, X-ray diffraction (XRD) analysis, X-ray fluorescence (XRF) analysis, specific surface area, specific gravity, and many other tests. To do such tests, in test standards, no specific drying method is recommended. This paper evaluates the effects of drying methods on the measured characteristics of dredged sediment. The drying methods investigated in the current study are oven-drying, freeze-drying, and air drying. From the results obtained, it seems that the drying method affects the results of the test done on the sediment. Among the drying methods, freeze-drying has less effect on sediment properties when the results are compared to a few properties measured on undried material. However, from the point of view of materials classification in road construction, no effects of drying methods are recorded.

疏浚沉积物是由矿物相、有机相和液相组成的复杂物质。要在实验室对沉积物进行表征,在进行某些测试(如有机物含量测定、X 射线衍射 (XRD) 分析、X 射线荧光 (XRF) 分析、比表面积、比重和其他许多测试)之前,应先将材料干燥。要进行这些测试,测试标准中没有推荐具体的干燥方法。本文评估了干燥方法对疏浚沉积物测量特性的影响。本研究调查的干燥方法有烘箱干燥法、冷冻干燥法和空气干燥法。从获得的结果来看,干燥方法会影响沉积物的测试结果。在各种干燥方法中,冷冻干燥法对沉积物特性的影响较小,因为其结果与未干燥材料所测得的一些特性相比较。不过,从筑路材料分类的角度来看,干燥方法没有影响。
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引用次数: 0
Effects of the angle between the rock strata and slope on flow hydraulics and sediment yield in karst trough valley: laboratory scour experiment 岩层与斜坡之间的角度对岩溶槽谷水流水力学和泥沙产量的影响:实验室冲刷实验
IF 3.6 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2023-12-20 DOI: 10.1016/j.ijsrc.2023.12.005
Yuqi Zhang, Lan Song, Yunfei Bi, Binghui He, Rongchang Zeng, Tianyang Li

The angle between the exposed bedrock and slope in a karst trough valley strongly affects overland flow behavior, thus, altering the generation of runoff and sediment. However, the directions and magnitudes of these effects remain unclear. The current study aimed to investigate the effects of the angle between the rock and slope on flow hydraulics, runoff, and sediment yield, as well as their linkages. A laboratory flume scour experiment was done under different combinations of angles between rock strata and slope (0°, 30°, 60°, 90°, 120°, and 150°), flow discharge rates (5, 7.5, and 10 L/min) and slope gradients (10°, 15°, and 20°) to simulate the field environment in a karst trough valley. The flow hydraulics (Reynolds number, flow velocity, flow depth, and Darcy-Weisbach friction factor), sediment yield, sediment concentration, and runoff rate were determined. The results showed that with increasing scour duration, the Reynolds number and flow velocity decreased but the flow depth and Darcy-Weisbach friction factor increased. The angle between the rock strata and slope significantly affected the flow velocity and Darcy-Weisbach friction factor, while slightly affecting the flow depth and Reynolds number. Over the scour duration, the runoff rate first increased and remained at a steady state but the sediment concentration and sediment yield rate first increased and then sharply decreased to a steady state. The sediment concentration and sediment yield rate both significantly decreased as the angle between the rock strata and slope increased. The runoff rate was closely linked to the flow velocity and Darcy-Weisbach friction factor as well as the sediment yield rate and sediment concentration. The current results indicate that the angle between the rock strata and the slope should be considered an important parameter when developing a soil erosion prediction model for karst trough valleys.

岩溶槽谷中裸露基岩与斜坡之间的角度会对陆地流的行为产生强烈影响,从而改变径流和沉积物的产生。然而,这些影响的方向和程度仍不清楚。本研究旨在调查岩石与斜坡之间的角度对水流水力学、径流和泥沙量的影响,以及它们之间的联系。为模拟岩溶槽谷的野外环境,在岩层与斜坡的不同角度组合(0°、30°、60°、90°、120°和 150°)、流量(5、7.5 和 10 升/分钟)和斜坡坡度(10°、15°和 20°)下进行了实验室水槽冲刷实验。测定了水流水力学(雷诺数、流速、流深和达西-韦斯巴赫摩擦因数)、泥沙产量、泥沙浓度和径流量。结果表明,随着冲刷持续时间的增加,雷诺数和流速降低,但水流深度和达西-韦斯巴赫摩擦因数增加。岩层与斜坡之间的夹角对流速和达西-韦斯巴赫摩擦因数有明显影响,而对水流深度和雷诺数影响较小。在冲刷持续时间内,径流量先增加后保持稳定,但泥沙浓度和泥沙产率先增加后急剧下降至稳定状态。随着岩层与斜坡之间夹角的增大,泥沙浓度和泥沙产率都明显下降。径流量与流速和达西-韦斯巴赫摩擦因数以及泥沙产流率和泥沙浓度密切相关。目前的研究结果表明,在建立岩溶槽谷水土流失预测模型时,岩层与斜坡之间的夹角应被视为一个重要参数。
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引用次数: 0
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IF 3.6 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2023-10-28 DOI: 10.1016/S1001-6279(23)00062-8
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引用次数: 0
The Igarapé Weir decelerated transport of contaminated sediment in the Paraopeba River after the failure of the B1 tailings dam (Brumadinho) B1尾矿坝溃决后,igarapeer堰减缓了Paraopeba河污染沉积物的运移(Brumadinho)
IF 3.6 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2023-10-01 DOI: 10.1016/j.ijsrc.2023.06.004
Daniela Patrícia Salgado Terêncio , Fernando António Leal Pacheco , Renato Farias do Valle Junior , Maytê Maria Abreu Pires de Melo Silva , Teresa Cristina Tarlé Pissarra , Marília Carvalho de Melo , Carlos Alberto Valera , Luís Filipe Sanches Fernandes

The B1 dam of Córrego do Feijão Mine, owned by Vale, S.A. mining company and located on the Ferro-Carvão stream, collapsed and injected 2.8 Mm3 of clayey, silty, and sandy iron- and manganese-rich tailings into the Paraopeba River (Minas Gerais state, Brazil). The accident occurred on 25 January 2019 and the tailings have been co-transported with coarser natural sediment since then, being partly trapped in the Igarapé Weir reservoir located on the Paraopeba River nearly 45 km downstream the injection point. The general purpose of the current study was to model suspended sediment transport in the vicinity of the Igarapé Weir aiming to assess the concomitant barrier effect imposed by this structure. Specifically, the spatial distributions of suspended clay, silt, and very fine-grained sand fractions (CSS) of sediment were mapped around the Igarapé Weir under low-flow (16 m3/s) and high-flow (5 to 10,000 years return period stream discharge; 699–2,699 m3/s) regimes, using RiverFlow2D as the modelling tool. The concentrations of the various grain materials in the upstream and downstream sectors were quantified linking the barrier effect to concentration reductions in the direction of stream flow. It was also a study goal to calculate differences of iron and manganese concentrations in the sediment + tailings mixtures along the Paraopeba River. The study results showed reductions in the CSS between 6.6% and 18%, from upstream to downstream of the Igarapé Weir, related with backwater effects, free and submerged hydraulic jumps, bank sedimentation in periods of high flow, and streambed sedimentation controlled by channel sinuosity and tailings density. These reductions were accompanied by drops in the concentrations of iron and manganese present in the clay and silt fractions, which varied between 6% and 42% under low flows and between 16% and 44% under high flows. Bank sedimentation was viewed as a potential threat to the riparian vegetation in the long-term. Dredging is the potentially most effective mitigation measure to help lead the Paraopeba River to a pre-rupture condition. The retention of sediment + tailings transported in suspension is less effective than the trapping of bedload sediment + tailings behind the Igarapé weir. The efficacy of sediment trapping is expected to be larger for natural sediment because it is much coarser than the tailings. In that context, the simulations revealed for the low-flow period that 33.6% of the sediment deposition comprised suspended transport of natural sediment (thus, was comprised 66.4% of bedload transport), this proportion rose to 86.9% for mixtures of natural sediment + tailings, a result that did not differ much for the high-flow periods.

巴西淡水河谷矿业公司拥有的Córrego do feij o矿山B1坝位于ferrocarv河上,坍塌后将2.8 Mm3的粘土、粉质和砂质富铁和富锰尾矿注入Paraopeba河(巴西米纳斯吉拉斯州)。事故发生在2019年1月25日,从那时起,尾矿与较粗的天然沉积物一起运输,部分被困在位于注入点下游近45公里处的Paraopeba河上的igarapeer堰水库中。本研究的一般目的是模拟伊加拉帕格尔堰附近的悬浮泥沙运输,旨在评估该结构所施加的伴随屏障效应。在低流量(16 m3/s)和高流量(5 ~ 1万年回潮期)条件下,绘制了igarapevoir周边沉积物悬浮粘土、粉砂和极细粒砂组分(CSS)的空间分布图;699 ~ 2699 m3/s)工况,使用RiverFlow2D作为建模工具。对上游和下游各段的各种粮食物质的浓度进行了量化,将屏障效应与水流方向的浓度降低联系起来。计算Paraopeba河沿岸沉积物+尾矿混合物中铁和锰浓度的差异也是研究的目标。研究结果表明,从上游到下游,igarapueweir的CSS降低了6.6% ~ 18%,这与回水效应、自由和淹没水力跳跃、高流量时期的河岸沉积以及河道弯曲度和尾矿密度控制的河床沉积有关。这些减少伴随着粘土和粉土组分中铁和锰浓度的下降,在低流量下变化在6%到42%之间,在高流量下变化在16%到44%之间。从长远来看,河岸沉积被视为对河岸植被的潜在威胁。疏浚可能是最有效的缓解措施,有助于将Paraopeba河引导到破裂前的状态。悬移泥沙+尾砂截留效果不如在伊加拉帕格尔堰后截留河床泥沙+尾砂。由于天然沉积物比尾砂粗得多,因此截留效果预期会更大。在此背景下,模拟结果显示,在低流量时期,33.6%的泥沙沉积是由自然泥沙的悬浮输运组成的(即占66.4%的床质输运),而在高流量时期,自然泥沙+尾矿混合输运的比例上升到86.9%,结果差异不大。
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引用次数: 0
Historical fluxes of metal and metalloids in an aquatic ecosystem affected by land-use change and mining activities in northwestern Mexico 墨西哥西北部受土地利用变化和采矿活动影响的水生生态系统中金属和类金属的历史通量
IF 3.6 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2023-10-01 DOI: 10.1016/j.ijsrc.2023.05.003
Ochoa-Contreras Roberto , Jara-Marini Martín Enrique , Ruiz-Fernández Ana Carolina , Sanchez-Cabeza Joan Albert , Meza-Figueroa Diana , Pérez-Bernal Libia Hascibe

Freshwater reservoirs are essential owing because of their ecological, economic, and social importance. They are particularly vulnerable to contamination, as of metal and metalloids, derived from anthropogenic activities like mining. The temporal variations in trace element concentrations (arsenic (As), mercury (Hg), chromium (Cr), copper (Cu), nickel (Ni), lead (Pb), and zinc (Zn)), enrichment, fluxes, and possible sources were evaluated by studying two sediment cores from the La Angostura (ANG) Reservoir (northwest Mexico), using 210Pb geochronology. The enrichment factors showed from null to minor enrichment for most elements, but moderate to severe enrichment of mercury (Hg). Most trace element concentrations had a detrital origin, and notable Hg concentration increases since the past decade were associated with severe drought periods, likely resulting from wildfires. The observed sediment concentrations of As and Hg can cause adverse effects on biota in the ecosystem since they are above the probable effect level (PEL). Development of strategies for metal attenuation in this reservoir is recommended and metals should be controlled until specific ecotoxicological studies are performed.

由于其生态、经济和社会重要性,淡水水库是必不可少的。它们特别容易受到来自采矿等人为活动的金属和类金属的污染。采用210Pb年代学方法,对墨西哥西北部La Angostura (ANG)水库两个沉积物岩心进行了研究,评价了沉积物中微量元素(砷(As)、汞(Hg)、铬(Cr)、铜(Cu)、镍(Ni)、铅(Pb)和锌(Zn))浓度、富集、通量和可能来源的时间变化规律。富集因子表现为大多数元素从零到轻度富集,但汞(Hg)从中度到重度富集。大多数微量元素浓度具有碎屑来源,过去十年以来汞浓度的显著增加与严重干旱期有关,可能是由野火引起的。观测到的As和Hg沉积物浓度超过了可能影响水平(PEL),可能对生态系统中的生物群产生不利影响。建议制定该储层中金属衰减的策略,并在进行具体的生态毒理学研究之前控制金属。
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引用次数: 0
TOC
IF 3.6 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2023-10-01 DOI: 10.1016/S1001-6279(23)00045-8
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引用次数: 0
A framework approach to address the trend and causes of flood stage change in a river reach downstream of a dam influenced by tributaries 解决受支流影响的大坝下游河段洪水水位变化趋势和原因的框架方法
IF 3.6 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2023-10-01 DOI: 10.1016/j.ijsrc.2023.05.001
Zhaohua Sun , Shanshan An , Xinyue Zhou , Zhiqing Li , Lei Zou

The evaluation of the trend of flood stage changes in alluvial rivers downstream of dams is important for flood management. However, the flood stage associated with a given discharge generally is nonstationary in river reaches with multiple tributaries. This is not only because of the dam-induced shifting in the cross-sectional area and/or channel roughness but also because of the backwater induced by high flows from the tributaries. To determine the total trend of the flood stage and quantify the separate contributions of hydrological and geomorphic effects, the current study proposed a framework approach consisting of hydrological analysis and multiscenario numerical modeling. By this means, the trend in the flood stage could be distinguished from the stage oscillation driven by varying factors, including extreme hydrologic events. The effects of chronic changes, including channel incision and flow resistance increase, also were quantitatively separated. This framework was applied to the Chenglingji–Datong (CD) reach downstream of the Three Gorges Dam (TGD) in the Yangtze River, China. The results indicated that the effect of the roughness increase counterbalanced the effect of channel incision when the flow discharge was beyond the bankfull level. The backwater effect induced by tributary inflow was the major cause of the flood stage rise in recent years. The method presented in the current study provides a useful tool for managers and engineers to obtain better insight into the driving mechanisms of flood stage changes in river reaches that are downstream of dams. These findings indicate that the flood stage may not decline or may even occasionally increase, although the cross-sectional area was enlarged by channel incision. Special attention should be given to the flood risk situation in the study reach after the TGD began operation.

大坝下游冲积河流洪级变化趋势的评价对洪水管理具有重要意义。然而,在有多条支流的河流中,与给定流量相关的洪水阶段通常是不稳定的。这不仅是因为大坝引起的横截面积的移动和/或河道的粗糙度,还因为支流的高流量引起的回水。为了确定洪期的总趋势,并量化水文和地貌效应的单独贡献,本研究提出了一个由水文分析和多情景数值模拟组成的框架方法。通过这种方法,可以区分洪水期的趋势和极端水文事件等多种因素驱动的期振荡。慢性变化的影响,包括通道切割和流动阻力增加,也被定量分离。该框架应用于长江三峡大坝下游城陵集—大同河段。结果表明,当流量超过堤岸水平时,粗糙度增加的影响抵消了通道切割的影响。支流入流引起的回水效应是近年来洪水位上升的主要原因。本研究中提出的方法为管理人员和工程师提供了一个有用的工具,可以更好地了解大坝下游河段洪水阶段变化的驱动机制。这些结果表明,虽然河道切割扩大了断面面积,但洪水期可能不会下降,甚至偶尔会增加。特别要注意三峡工程投产后研究河段的洪涝风险情况。
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引用次数: 0
Rapid magnetic susceptibility measurement as a tracer to assess the erosion–deposition process using tillage homogenization and simple proportional models: A case study in northern of Morocco 快速磁化率测量作为示踪剂,利用耕作均质化和简单比例模型评估侵蚀-沉积过程:以摩洛哥北部为例研究
IF 3.6 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2023-10-01 DOI: 10.1016/j.ijsrc.2023.06.002
Abdessalam Ouallali , Naima Bouhsane , Saidati Bouhlassa , Mohamed Moukhchane , Shamsollah Ayoubi , Habiba Aassoumi

Soil erosion is a significant threat in the Rif region in northern Morocco. Hence, accurate cartography of the phenomenon, magnitude, and extent of erosion in the area needs a simple, rapid, and economical method such as magnetic susceptibility (MS). The current study aims to: (i) determine the factors influencing the variation of soil MS, (ii) exploit MS to estimate soil loss using two approaches in different homogenous units characterized by the same climatic conditions with different edaphic characteristics (land use, slope, and lithology), and (iii) highlight the potential for using MS as a cheap and rapid tracer of a long term erosion and deposition processes. Mass-specific magnetic susceptibility at low (χlf) and high (χhf) frequencies were measured for 182 soil samples collected in the study area. A tillage homogenization (T-H) model and a simple proportional model (SPM) were applied on an undisturbed soil profile to predict the eroded soil depths for given cores. The results confirm that χlf is influenced by land use, slope, and soil type. Pedogenesis is the main factor affecting soil MS enhancement, indicated by homogenous magnetic mineralogy with a dominance of super-paramagnetic (SP) and stable single domain (SSD) magnetic grains. The study results show that higher soil losses have occurred in almost all the soil samples when applying the T-H model compared to application of the SPM. The SPM underestimates erosion due to its ignorance of the MS of the plow layers after erosion. The current study implies the high efficacy of magnetic susceptibility as the quick, easily measurable, simple, and cost-effective approach that can be used as an alternative technique for evaluating soil redistribution.

土壤侵蚀是摩洛哥北部里夫地区的一个重大威胁。因此,要准确地绘制该地区的侵蚀现象、程度和程度,需要一种简单、快速和经济的方法,如磁化率(MS)。目前的研究旨在:(i)确定影响土壤质谱变化的因素,(ii)利用质谱在具有相同气候条件和不同土壤特征(土地利用、坡度和岩性)的不同同质单元中使用两种方法来估计土壤流失,以及(iii)强调利用质谱作为长期侵蚀和沉积过程的廉价和快速示踪剂的潜力。对研究区182份土壤样品进行了低(χlf)和高(χhf)频率的质量比磁化率测定。在原状土壤剖面上应用耕作均质化模型和简单比例模型对给定岩心的侵蚀土壤深度进行预测。结果证实χ f受土地利用、坡度和土壤类型的影响。土壤成土作用是影响土壤质谱增强的主要因素,表现为均匀的磁性矿物学特征,以超顺磁(SP)和稳定的单畴(SSD)磁性颗粒为主。研究结果表明,与SPM相比,T-H模型在几乎所有土壤样品中都发生了更高的土壤流失量。由于忽略了侵蚀后耕层的质谱,SPM低估了侵蚀。目前的研究表明,磁化率作为一种快速、易于测量、简单且经济有效的方法,可以作为评估土壤再分配的替代技术。
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引用次数: 1
Experimental investigation of sediment transport in partially ice-covered channels 部分冰雪覆盖河道泥沙输移的实验研究
IF 3.6 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2023-10-01 DOI: 10.1016/j.ijsrc.2023.06.003
Mina Rouzegar, Shawn P. Clark

It is important to understand the effects of ice cover on sediment transport in cold climates, where sub-freezing temperatures affect water bodies for a significant part of the year. The literature contains many studies on sediment transport in open channel flow, and several studies on sediment transport in completely ice-covered flow. There has been little or no research on sediment transport in partially ice-covered channels. In the current study, laboratory experiments were done in a rectangular flume to quantify the impact of border ice presence on the sediment transport rate. The effects of ice cover extent and changing flow strengths on sediment transport distribution also were investigated, and the results were compared to those for fully ice-covered and open channel flow. The ice coverage ratios considered were 0 (representing the open water condition), 0.25, 0.50, 0.67, and 1 (representing fully ice-covered flow). The partial ice cover was found to impact the sediment transport distribution within the channel. The effect of ice coverage extent on sediment transport distribution was more significant at lower flow strengths and became negligible at higher flow strengths. The conventional equations for sediment transport in open channel flow and fully ice-covered flow that relate the dimensionless bedload transport rate to the flow strength were found to be applicable to estimate the total cross-section-averaged bedload transport for partially ice-covered flow when modified appropriately. Empirical coefficients for these equations were determined using the experimental data.

在寒冷气候中,了解冰盖对沉积物运输的影响是很重要的,在寒冷气候中,低于冰点的温度在一年中的大部分时间都会影响水体。文献中有很多关于明渠流输沙的研究,也有一些关于全冰覆盖流输沙的研究。对部分冰覆盖河道中泥沙输移的研究很少或根本没有。在目前的研究中,在一个矩形水槽中进行了实验室实验,以量化边界冰的存在对沉积物输运率的影响。研究了冰覆盖范围和水流强度变化对泥沙输运分布的影响,并与全冰覆盖和明渠水流的结果进行了比较。考虑的冰覆盖比分别为0(代表开放水域)、0.25、0.50、0.67和1(代表完全被冰覆盖的流量)。发现部分冰覆盖对河道内泥沙输运分布有影响。冰覆盖范围对输沙分布的影响在低流强条件下更为显著,在高流强条件下可以忽略不计。经适当修正后,发现明渠流和全冰覆盖流的常规输沙方程将无量纲质输沙率与流强度联系起来,适用于估算部分冰覆盖流的总断面平均质输沙量。利用实验数据确定了这些方程的经验系数。
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引用次数: 1
Improving hydrodynamic modeling of river networks by incorporating data assimilation using a particle filter 通过使用粒子滤波器结合数据同化改进河网的水动力学建模
IF 3.6 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2023-10-01 DOI: 10.1016/j.ijsrc.2023.06.001
Chenhui Jiang , Dejun Zhu , Haobo Li , Xiaoqun Liu , Danxun Li

Numerical modeling is a well-recognized method for studying the hydrodynamic processes in river networks. Multi-source measurements also offer abundant information on the patterns and mechanisms within the processes. Therefore, improving hydrodynamic modeling of river networks through the use of data assimilation techniques has become a hot research topic in recent years. The particle filter (PF) is a commonly used data assimilation method and has been proven to be applicable to various nonlinear and non-Gaussian models. In the current study, an improved numerical hydrodynamic model for large-scale river networks is established by incorporating the advanced PF algorithm. Furthermore, the PF method based on the Gaussian likelihood function (GLF) and the method based on the Cauchy likelihood function (CLF) are compared for a complex river network scenario. The feasibility of the PF-based methods was evaluated through application to the Yangtze-Dongting River-lake Network (YDRN) by assimilating water stage data collected at six hydrometric stations during the entire hydrodynamic process in 2003. Additionally, the parameters used in the likelihood function, which affect the assimilation performance, also were explored in the current study. The study results found that the accuracy of the model-derived water stage data was improved when the PF-based methods are utilized, with improvement not only at the data assimilation (calibration) sites but also at three hydrometric stations not used in the data assimilation (i.e., verification sites). The highest average Nash-Sutcliffe Efficiency result for the six assimilation sites were 0.98 while the lowest summed root-mean-square-error result was 1.801 m. The comparison results also indicated that the CLF-based PF outperformed the GLF-based PF when high-accuracy observed data are available. Specifically, the CLF can effectively resolve the filtering failure problem and the dispersion problem of PFs, and further improve the accuracy of the filtering results for a river network scenario. In summary, the CLF-based PF method along with high-accuracy observation data shows promise to provide reliable reference and technical support for hydrodynamic modeling of large-scale river networks.

数值模拟是研究河网水动力过程的一种公认的方法。多源测量还提供了关于流程中的模式和机制的丰富信息。因此,利用数据同化技术改进河网水动力模拟已成为近年来的研究热点。粒子滤波(PF)是一种常用的数据同化方法,已被证明适用于各种非线性和非高斯模型。本文结合先进的PF算法,建立了一种改进的大尺度河网水动力数值模型。在复杂河网情景下,比较了基于高斯似然函数(GLF)和基于柯西似然函数(CLF)的PF方法。通过对2003年长江-洞庭湖网6个水文站在整个水动力过程中收集的水位资料进行同化,评价了基于pf方法的可行性。此外,本研究还探讨了影响同化性能的似然函数中使用的参数。研究结果发现,采用基于pf的方法后,模型推导的水级数据的精度有所提高,不仅在数据同化(定标)站点,而且在未进行数据同化的3个水文站(即验证站点)也有所提高。6个同化点的平均Nash-Sutcliffe效率最高为0.98,均方根误差最低为1.801 m。对比结果还表明,在具有高精度观测数据的情况下,基于clf的PF优于基于glf的PF。具体而言,CLF可以有效解决PFs的滤波失效问题和色散问题,进一步提高河网场景滤波结果的准确性。综上所述,基于clf的PF方法和高精度的观测数据有望为大尺度河网水动力建模提供可靠的参考和技术支持。
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引用次数: 0
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International Journal of Sediment Research
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