International Journal of Sediment Research最新文献

{"title":"Temporal and spatial evolution characteristics of the current tail channel of the Yellow River: Processes and mechanisms","authors":"","doi":"10.1016/j.ijsrc.2024.04.007","DOIUrl":"10.1016/j.ijsrc.2024.04.007","url":null,"abstract":"<div><p>The Qingshuigou Channel, as the current tail channel of the Yellow River, formed by the diversion of the Diaokou River in 1976, has undergone a particularly dramatic spatio-temporal evolution, and its evolution processes and the underlying mechanisms are still unclear. On the basis of the flood season cross section data for the river downstream of the Lijin Hydrological Station from 1976 to 2017, the current study calculated the main channel morphological characteristics of the tail channel in different reaches using a reach-scale morphological parameter calculation method and <em>K</em>-means clustering analysis. An elevated riverbed index was proposed to identify the elevated riverbed situation of the river channel. The results show that from 1976 to 2017, the bankfull area experienced repeated processes of decrease and increase, and the main channel morphology gradually changed from wide and shallow to narrow and deep over time. For most of the time period, the conveyance capacity of the main channel gradually decreased from upstream to downstream. The elevated riverbed situation gradually became more severe along the river reach from 0 to 85 km away from Lijin, but was less severe in the reach more than 85 km downstream of Lijin. The most severe elevated riverbed situation appeared mainly in the range of 71–83 km below Lijin in 1991–1995. When the sediment-carrying capacity of the water flow was strong, the bankfull area of the main channel increased, and the elevated riverbed situation was alleviated. River channel projects have helped to maintain the narrow and deep shape of the main channel, but the installation of farm dikes have aggravated the elevated riverbed situation. At the same time, extension and diversion of the tail channel have changed the erosion base level, greatly affecting the evolution of the channel morphology. The current study has provided a typical case for exploring the processes and mechanisms of tail channel evolution.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S100162792400043X/pdfft?md5=0b015bf468d944098dbd0217e55fa59d&pid=1-s2.0-S100162792400043X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140933744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unravelling the mesoscale saltmarsh accretion on the tropical barrier estuarine regime: A case study from the Chandipur Saltmarsh, India","authors":"","doi":"10.1016/j.ijsrc.2024.03.007","DOIUrl":"10.1016/j.ijsrc.2024.03.007","url":null,"abstract":"<div><p>Coastal wetlands are seen as efficient coastal stabilizers and provide an optimal natural ecosystem for the sequestration and storage of carbon. Thus, it is critically important for scientists and environmental managers to understand the future dynamics of coastal wetlands. The understanding of yearly to decadal development in coastal ecosystems can assist in the coastal management activity, to sustain biodiversity. In the current study, high-resolution granulometric analysis of a back-barrier salt-marsh deposit of tropical barrier estuary environments at Chandipur, India, is utilized to provide an overview of the mesoscale geomorphic processes and history of changing sediment dynamics. The multivariate statistical examination with coefficients of probability density functions and compositional data analysis helps to determine the four lithofacies of the deposit. Granulometric analysis combined with satellite image analysis reveals that relatively coarser facies were deposited during the incipient stage of the barrier development, when the marshland vegetation was relatively less dense as suggested by the lower normalized difference vegetation index (NDVI) and the saline sea water easily drowned the area and saline sediment was deposited. After rapid marsh accretion, the flow dynamics shifted to a negligible flow component in the final stage when finer facies were deposited in vegetated marshland, and the organic carbon concentration increased up to 3.5%. As plant organic matter and sediment continuously accumulates in this marshland, elevation capital grows and the marsh continues to develop and expand, reaching a densely vegetated marsh with a considerable increase in NDVI values. The findings of this multiproxy study, in conjunction with multivariate statistical analysis, provide valuable insight into the characteristics of accretion in a tropical saltmarsh, which is unique in such a geological setting.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000325/pdfft?md5=92a6299a241d255efdb97cc3c39729e4&pid=1-s2.0-S1001627924000325-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140806482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A high-resolution water quality model coupled sediment and suspended sediment module","authors":"","doi":"10.1016/j.ijsrc.2024.05.004","DOIUrl":"10.1016/j.ijsrc.2024.05.004","url":null,"abstract":"<div><p>Water environment numerical models considering detailed hydrodynamic processes are effective tools to better understand the pollutant transport and transformation mechanisms and the influences of sediment and suspended sediment on pollutants in rivers in complex terrain. However, these models can hardly achieve simultaneous high-efficiency and high-accuracy simulation of large-area rivers in complex terrain. Therefore, a high-resolution water quality model was developed coupled with a sediment and suspended sediment module (GAST). The Compute Unified Device Architecture (CUDA) parallel computing architecture and robust model algorithms were used, and the model performance and functionality were improved. This model was based on detailed physical processes, while water environment parameter spatial heterogeneity also was considered. A simulation function of multiphase pollutant transport and mutual transformation was established by solving the pollution adsorption kinetic equation applicable to high-resolution terrain. The transport and mutual transformation processes of multiphase pollutants in still water and steady uniform flow were verified by considering the Nash–Sutcliffe efficiency (NSE) coefficient which exceeded 0.99. The validated high-resolution water quality model was applied to simulate a river network water environment in a sulfurous iron ore area, and the numerical results for the sulfate ion concentration spatial distribution and pollution sources of sulfate ions in the sediment and water phases were explored. The results show that the concentration of sulfate ions in the Xiaowenyu River varies between 120 and 180 mg/L. The contribution rates of the 5 tributaries with slag heaps in the lower reaches to the sulfate ion load in the Xiaowenyu River followed the order of Guojiagou (15.7%) &gt; Baoquansi (14.6%) &gt; Zhuyuangou (9.2%) &gt; Qingshigou (2.8%) &gt; Sunjiagou (1.4%). On an RTX30700d computer, only 0.55 h was needed to simulate the hydrodynamic and water quality evolution process involving 653,112 cells for a 6-h model setting. The model attained a high computational efficiency and high operation speed. This study provides a reliable tool for further study of river pollution mechanisms and river water environmental management.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000593/pdfft?md5=53671953f9cc38a4ff89708eb4faafc3&pid=1-s2.0-S1001627924000593-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141169554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution, sources, and burial flux of black carbon in sediment of Daye lake, central China","authors":"Changlin Zhan ,&nbsp;Yongming Han ,&nbsp;Jiaquan Zhang ,&nbsp;Shan Liu ,&nbsp;Hongxia Liu ,&nbsp;Wensheng Xiao ,&nbsp;Junji Cao","doi":"10.1016/j.ijsrc.2024.07.005","DOIUrl":"10.1016/j.ijsrc.2024.07.005","url":null,"abstract":"<div><p>Black carbon (BC), primarily originating from fossil fuel and biomass combustion, holds significance for global carbon cycling, climate change, and human health. Despite a lake's role as a carbon sink, detailed information about BC sedimentary burial flux and sink in its sediment remains insufficiently explored. The current study investigates the distribution, sources, and burial flux of BC and its subtypes (char and soot) in the surface sediment of Daye Lake, the largest lake in Huangshi City, central China. BC concentrations in the sediment ranged from 0.10 to 3.60 mg/g, corresponding to 0.40%–17.02% of organic carbon (OC). Higher values of BC and BC/OC observed in the western region suggest direct terrestrial input via river discharge and surface runoff, influenced by anthropogenic activities. In contrast, variations in char/soot ratios reflect diverse combustion sources and hydrological dynamics in different regions. The indications from BC/OC and char/soot ratios imply that fossil fuel combustion is the predominant sources. The weak correlations between BC and OC suggest that they may come from different sources or undergo different processes that affect their distribution in the lake sediment. However, a stronger correlation was observed between BC and soot, as well as between char and soot, indicating potential similarities in their input pathways. The BC burial flux displays notable variations across the lake, ranging from 0.69 to 24.07 g/m²/yr, with elevated values observed in the western region. The BC sink in the sediments of Daye Lake was estimated to be 0.635 Gg/yr. Though locally small, it significantly contributes to the broader picture of BC burial in Chinese lakes and the global distribution of BC in lake ecosystems.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000799/pdfft?md5=9943760b35832338f3aa00de62268166&pid=1-s2.0-S1001627924000799-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141947620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of SPH in rheology model for the submerged landslide","authors":"Pooyan Nikeghbali ,&nbsp;Rohan Benjankar ,&nbsp;Mehran Kheirkhahan","doi":"10.1016/j.ijsrc.2024.07.003","DOIUrl":"10.1016/j.ijsrc.2024.07.003","url":null,"abstract":"<div><p>The seafloor environment is prone to rapid changes caused by landslides, which can result in significant human, financial, and environmental consequences. Previous research efforts have primarily focused on studying rigid submerged landslides using physical experiments and mesh-based numerical simulations. However, there is a need to investigate deformable soil masses due to their inherent complexity. In the current study, a smoothed particle hydrodynamics (SPH) method was developed to examine the behavior of submerged landslides. Three rheological models, namely Bingham, Herschel–Bulkley (H–B), and <em>μ</em>(<em>I</em>), were applied to characterize the properties of the sediment materials. The SPH governing equations were modified at the interface between the water and sediment phases to account for the density discontinuity between them. The viscosity term at this interface was determined using the Owens equation. The effective pressure, a crucial parameter in rheological models, was appropriately modified to reflect the influence of the water column on the sediment particles, utilizing a simple algorithm. For the <em>μ</em>(<em>I</em>) rheology, separate equations were applied to describe the behavior of dry and saturated conditions. Additionally, the Mohr–Coulomb criteria were utilized in the Bingham and H–B models to determine the yield stress. To validate the effectiveness of the proposed modeling approach, a column failure scenario was first simulated. Subsequently, a rigid submerged landslide was investigated to assess the capability and validity of the proposed framework in accurately capturing surge wave generation and calibrating the boundary friction factor. Finally, two deformable submerged landslides involving different materials, namely sand and glass beads, were simulated and compared with previous experimental and numerical studies at different time steps. Through these comprehensive investigations, the current understanding of the complex behavior exhibited by submerged landslides is enhanced, and valuable insight into landslide dynamics is provided.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000763/pdfft?md5=cfa063d53845ac63a4a08ba72ff52384&pid=1-s2.0-S1001627924000763-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141772931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemical indices and sedimentation rates in the Pardo River basin, São Paulo state, Brazil","authors":"Daniel Marcos Bonotto","doi":"10.1016/j.ijsrc.2024.07.002","DOIUrl":"10.1016/j.ijsrc.2024.07.002","url":null,"abstract":"&lt;div&gt;&lt;p&gt;Sediment geochemical indices and sedimentation rates data from the Pardo River watershed, São Paulo State, Brazil, provide relevant reference guidelines for stakeholders to plan future actions aiming to achieve the appropriate management of that hydrographic basin. The watershed includes 20 municipalities where about 650,000 inhabitants are living and whose waters after withdrawal and treatment supply ∼300,000 people in that region. Six sediment cores provided the geochemical and radiometric dataset, which was obtained from sampling sites located in the following cities: Ourinhos, Santa Cruz do Rio Pardo, Águas de Santa Bárbara, Avaré, Botucatu, and Pardinho. The concentration data for some metals were compared with the reference values established by the Brazilian environmental legislation for sediment dredging because currently there is a lack of specific quality guidelines for marine or fluvial sediment in Brazil. Also, the entire dataset was used in the calculation of two traditional geochemical indices, i.e., the enrichment factor (EF) and contamination factor (CF). In some cores, both indices provided insight revealing possible anthropogenic inputs of magnesium oxide (MgO), potassium oxide (K&lt;sub&gt;2&lt;/sub&gt;O), sulfur trioxide (SO&lt;sub&gt;3&lt;/sub&gt;), vanadium oxide (V&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;), copper (II) oxide (CuO), and other constituents due to development of activities related to the crop production. The constant rate of supply (CRS) of the unsupported/excess lead 210 (&lt;sup&gt;210&lt;/sup&gt;Pb) model has been successfully applied to the obtained a radiometric &lt;sup&gt;210&lt;/sup&gt;Pb dataset, yielding mean values of the mass accumulation rate (MAR) between 0.86 and 7.23 g/(cm&lt;sup&gt;2&lt;/sup&gt;·y) and linear sedimentation rates (LSR) ranging from 2.9 to 7.1 cm/y. Both of these rates exhibited a significant correlation, representing physical weathering processes occurring in the basin. Chemical weathering rates reported in the literature indicate values much lower than the physical weathering rates and such findings have also been confirmed in the current study when the obtained data were compared with results from previous investigations in the Pardo River watershed. The CRS &lt;sup&gt;210&lt;/sup&gt;Pb chronological model was useful to track historical changes in the MgO and CuO concentration in the sediment cores, allowing curves to be plotted exhibiting major peaks in core 1 (1980–2010) and core 3 (2000–2010), a continuous increase from 1970 onwards until 2010 (core 4), and a sharp increase at the end of the monitoring period, 2017 (cores 5 and 6). Data available for the harvested area at a municipality located within the basin for the period 1990–2022 have indicated a more pronounced increase over the last years in the production of sugar cane, soybeans, and oranges, implying an increasing use of fertilizers and agricultural correctives for crop production, whose chemical composition would justify the trends observed for MgO and CuO concentrations in the sediment core","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000751/pdfft?md5=d4bfcc761ac985a5872fda6162172718&pid=1-s2.0-S1001627924000751-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141772939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of tree and shrub species on soil quality, sediment detachment capacity caused by rills and surface slope stability in forest lands of Northern Iran","authors":"Misagh Parhizkar","doi":"10.1016/j.ijsrc.2024.07.001","DOIUrl":"10.1016/j.ijsrc.2024.07.001","url":null,"abstract":"<div><p>A root system is an important factor to increase soil resistance to detachment of soil particles. However, due to the large number of species, there is a need for studying the impacts of native plant species on soil quality and soil erodibility. This investigation did flume experiments at various soil slopes (9.2%, 18.1%, 25.1%, and 32.5%) and different water flow rates (0.56, 0.67, 0.74, 0.81, and 0.94 L/(m·s)), to evaluate sediment detachment capacity caused by rills (<em>D</em>_c) and rill erodibility (<em>K</em>_r) as well as the soil quality of hillslopes with three common species including <em>Carpinus betulus</em> (as a natural tree species), <em>Alnus glutinosa</em> (as a planted tree species) and <em>Mespilus germanica</em> (as a shrub species) in forestland of northern Iran. The variability of <em>D</em>_c has been associated with soil properties and root characteristics of <em>Carpinus betulus</em>. <em>D</em>_c was significantly lower (average, −45%) for soils under <em>Carpinus betulus</em> compared to soils with the two other plant species (<em>p</em> &lt; 0.01). This was due to the higher values of soil properties including medium weight diameter of soil aggregates (MWD), organic carbon (OC), total nitrogen (TN), total phosphorous (TP), potassium (K), calcium (Ca), magnesium (Mg) as well as to the more extended root system, as confirmed by the negative correlations between <em>D</em>_c and the studied variables. <em>K</em>_r also was different among the studied soils and plant species. The root system of <em>Carpinus betulus</em> also played a useful role for increasing soil resistance to rill erosion yielding a safety factor (1.61) in the studied forest ecosystem. Overall, the current study supports a broader use of native species (such as <em>Carpinus betulus</em>) in areas exposed to surface erosion and instability, as an effective eco-engineering conservation technique and an alternative technology instead of utilizing artificial and expensive management practices.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S100162792400074X/pdfft?md5=9520cf1f43d4c919dcc36a3e861765bc&pid=1-s2.0-S100162792400074X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141693473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Grain-size distribution in suspension under non-equilibrium conditions","authors":"Arun Kumar,&nbsp;Sourav Hossain,&nbsp;Sumit Sen,&nbsp;Shiv Mohan,&nbsp;Koeli Ghoshal","doi":"10.1016/j.ijsrc.2024.06.003","DOIUrl":"10.1016/j.ijsrc.2024.06.003","url":null,"abstract":"<div><p>This paper presents a model to characterize the distribution of non-uniform sediment in suspension above erodible sediment beds in turbulent flow under non-equilibrium conditions. The modeling process incorporates three crucial features of sediment-laden flow: mixing length, stratification, and settling velocity. The advection–diffusion equation for the <span><math><mrow><mi>k</mi></mrow></math></span>-th grain-size class is modified accordingly. The model's calculations encompass the determination of reference height and reference concentration, accounting for the presence of different-sized particles in the flow. The numerical solution of the model effectively captures concentration variations for distinct particle sizes in streamwise and vertical directions, as well as temporal changes. As experimental data under non-equilibrium conditions with different sediment sizes are unavailable, the study focuses on specific experiments involving various sediment beds with a mixture of different grain sizes under equilibrium conditions. The current findings reveal that the concentration magnitude decreases downstream with time for all grain sizes, eventually reaching an equilibrium state. This behavior is consistent with variations in downstream distance at a specific time. The mixing length which is concentration-dependent, first increases the suspension concentration for all grain sizes at smaller downstream distance and then the effect reverses for all grain sizes at larger downstream distance. A similar trend is observed when considering both stratification and mixing length. An error analysis evaluates the model's performance, indicating that the least error corresponds to datasets incorporating all considered effects.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000659/pdfft?md5=3fe4708f4a1937e75c6d35f161b2715c&pid=1-s2.0-S1001627924000659-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142075772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural sediment connectivity as a tool in validating sediment fingerprinting results","authors":"","doi":"10.1016/j.ijsrc.2024.06.002","DOIUrl":"10.1016/j.ijsrc.2024.06.002","url":null,"abstract":"<div><p>Sediment control in watersheds requires information about soil erosion and sediment yield hotspot areas. Sediment connectivity is an emerging concept contributing to this field and structural sediment connectivity is a concept derived from sediment connectivity. Determining structural sediment connectivity in a watershed can yield a comprehensive image of sediment management possibilities applicable at the watershed scale. However, in most studies, the validity of extracted sediment connectivity maps has not been evaluated holistically. The current study is, therefore, designed to determine a valid structural sediment connectivity map and to use it to validate findings of sediment fingerprinting of the Idelo watershed in Zanjan province, Iran. Digital elevation model (DEM), slope, vegetation cover, and flow accumulative layers have been used in compiling the structural sediment connectivity map. Field observations were made to calculate the field connectivity index. The results showed that the mean structural sediment connectivity index of the target watershed is −6.18. Moreover, areas in the downslope section near the outlet and the narrow strips around the watershed boundaries have moderate to high structural connectivity. The results of field validation showed there is an acceptable agreement between the field connectivity index and the structural connectivity map. Also, these results confirmed previous findings of sediment fingerprinting in the study area. Based on the findings of the current study, determining the structural sediment connectivity index is an efficient method to make management and conservation decisions and control erosion and sediment in the watershed.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000647/pdfft?md5=098d59cf86f4ac8ad020e30e3e912fab&pid=1-s2.0-S1001627924000647-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of non-equilibrium parameters on the numerical modeling of settling basins","authors":"","doi":"10.1016/j.ijsrc.2024.06.001","DOIUrl":"10.1016/j.ijsrc.2024.06.001","url":null,"abstract":"<div><p>Settling basins are one of the structures required for removing excess sediment entering irrigation or power canals diverting water from a river. A numerical model is needed to simulate the flow and sedimentation pattern in settling basins. In the current research, a depth-averaged two-dimensional numerical model of flow and sediment is developed using the finite volume method and based on the time-splitting scheme, which also allows for simulating sediment in a non-equilibrium state. The simulation of flow and sedimentation is done by the numerical model in a decoupled method. Sensitivity analysis was applied to estimate the effects of non-equilibrium parameters and the settling velocity on the numerical results. The results revealed that Maleki and Khan's formula and Zhang and Xie's formula are suitable for estimating the suspended load adaptation coefficient and the sediment settling velocity in the numerical simulations. Investigation of the formulas for the bed adaptation length indicated that all three methods considered in the current research had almost equal accuracy in predicting the sediment concentration distribution in the settling basin. The developed model has been verified against two experimental tests, showing a good fit between observed data and the simulated results.</p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1001627924000635/pdfft?md5=7e1edfc40197f6122ef402dd4aa3f2d5&pid=1-s2.0-S1001627924000635-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141549459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}