检索结果-内蒙古大学图书馆

The impact of climate change under different thinning regimes on carbon sequestration in a German forest district

MITIGATION AND ADAPTATION STRATEGIES FOR GLOBAL CHANGE 2016年第6期21卷 861-881页

作者： Borys, A. Suckow, F. Reyer, C. Gutsch, M. Lasch-Born, P. Potsdam Inst Climate Impact Res POB 60 12 03 D-14412 Potsdam Germany

The objective of this paper is to assess how much carbon (C) is currently stored in a forest district in Thuringia, Germany, and how the carbon stocks will develop up to the year 2099 with a changing climate and under various management regimes (including no management), with different assumptions about carbon dioxide (CO2) fertilization effects. We applied the process-based model 4C and a wood product model to a forest district in Germany and evaluated both models for the period from 2002 to 2010, based on forest inventory data for the stands in the district. Then, we simulated the growth of the stands in the forest district under three different realizations of a climate change scenario, combined with different management regimes. Our simulations show that in 2099, between 630 and 1149 t C ha(-1) will be stored in this district. The simulations also showed that climate change affects carbon sequestration. The no management strategy sequestered the highest amount of carbon (8.7 t C ha(-1) year(-1)), which was greater than the management regimes. In the model, the possible fertilization effect of CO2 is an important factor. However, forest management remains the determining factor in this forest district.

关键词： 4C CO2 fertilization Forest growth and harvest Thinning from above and below Unmanaged Thuringia process-based modeling Wood product model

来源：评论

学校读者我要写书评

暂无评论

Morphodynamic Resilience of Intertidal Mudflats on a Seasonal Time Scale

引用

JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 2019年第11期124卷 8290-8308页

作者： van der Wegen, M. Roelvink, J. A. Jaffe, B. E. IHE Delft Inst Water Educ Water Sci & Engn Dept Delft Netherlands Deltares Civil Engn & Geosci Fac Delft Netherlands Delft Univ Technol Delft Netherlands USGS Pacific Coastal & Marine Sci Ctr Santa Cruz CA USA

Intertidal mudflats are morphodynamic features present in many estuaries worldwide. Often located between vegetated shores and deep channels they comprise valuable ecosystems and serve to protect the hinterland by attenuating waves. Although mudflats are persistently present on yearly to decadal time scales, little is known on their morphodynamic adaptation to short-term variations in forcing such as storms, spring-neap tidal cycles, and sediment supply. This study aims to explore the morphodynamic resilience of mudflats to seasonal variations in forcing. First, we compare transects observed in South Bay, California, at 3- to 6-monthly intervals. Second, we present the results of a process-based, morphodynamic profile model (Mflat). Mflat is an open source, Matlab code that describes both cross-shore and alongshore tidal hydrodynamics as well as a stationary wave model. An advection-diffusion equation solves sediment transport while bed level changes occur by the divergence of the sediment transport field. Mflat reproduces the observed South San Francisco Bay profile in equilibrium with significant skill. Short-term variations in hydrodynamic forcing and sediment characteristics disturb the profile mainly at the channel-shoal edge. The modeled profile disturbance is consistent with observations. The modeled profile is remarkably resilient since it recovers to the equilibrium profile within weeks to months. The model results suggest that 3-monthly observation intervals are probably too long to discriminate processes responsible for the profile disturbance. These processes may include variations in sediment supply, mudflat erodibility, and wave action as well as the spring-neap tidal cycle.

关键词： mudflats estuarine morphodynamics process-based modeling intertidal area coastal resilience channel-shoal interactions

来源：评论

学校读者我要写书评

暂无评论

modeling sugarcane development and growth within ECOSMOS biophysical model

引用

EUROPEAN JOURNAL OF AGRONOMY 2024年 154卷

作者： Colmanetti, Michel Anderson Almeida Cuadra, Santiago Vianna Lamparelli, Rubens Augusto Camargo Cabral, Osvaldo Machado Rodrigues de Freitas, Helber Custodio de Castro Victoria, Daniel Galdos, Marcelo Valadares Marafon, Anderson Carlos de Andrade Junior, Aderson Soares Silva, Sergio Delmar Buffon, Vinicius Bof Hernandes, Thayse Aparecida Dourado le Maire, Guerric Univ Estadual Campinas Ctr Energy Planning BR-13083896 Campinas SP Brazil EMBRAPA Digital Agr BR-13083886 Campinas SP Brazil EMBRAPA Environm BR-13820000 Jaguariuna SP Brazil Sa Paulo State Univ BR-17033360 Bauru SP Brazil Rothamsted Res Sustainable Soils & Crops Harpenden AL5 2JQ England EMBRAPA Coastal Tablelands BR-57100000 Rio Largo AL Brazil EMBRAPA Midnorth BR-64008780 Teresina Brazil EMBRAPA Temperate Agr BR-96001970 Pelotas RS Brazil EMBRAPA Cerrados BR-73310970 Brasilia DF Brazil Brazilian Ctr Res Energy & Mat CNPEM Brazilian Biorenewables Natl Lab BR-13083100 Campinas SP Brazil CIRAD UMR Eco & Sols F-34398 Montpellier France Univ Montpellier Eco&Sols IRD INRACIRADSupAgro Montpellier France

Sugarcane plays an important role in electricity and sugar production and is a viable biofuel. Developing and optimizing a mechanism that can predict crop growth and yield at different spatiotemporal scales can promote the understanding of the effects of cultivation on the ecosystem, while providing options for optimizing management measures and improving the operational procedures of sugarcane growers. The main objective of this study is to integrate the sugarcane module into the ECOSystem MOdel Simulator (ECOSMOS) model and calibrate a parameter set for sugarcane genotypes groups (using different datasets);the model supports datasets that vary in complexity (from flux tower experiments to operational plots), while accounting for high genotype-byenvironment-by-management (GxExM) variability. First, we calibrated the ECOSMOS biophysical and physiological parameters for the sugarcane module using two micrometeorological experimental sites, based on eddycovariance and biomass measurements. Second, sugarcane genotypes located in different regions of contrasting climate conditions were split into two groups based on their period of harvest, i.e., early or mid-to-late harvest season, and two parameter sets were proposed. The sugarcane module was used to estimate the yield of numerous plots, using two different parameter sets, namely, the general and regionally-specific parameter sets. The model could successfully simulate the biophysical and physiological processes of the biomass of stalks and leaves, energy and carbon fluxes, and soil-water dynamics;for Experimental Site 2, the Nash-Sutcliffe efficiency (NSE) was 0.14-0.86 and the relative root mean square error (RRMSE) was 13-112. However, the generic parameter set did not perform well in all production environments, and the difference between the observed and simulated yields ranged from 0.9 to 14.5 (Mg ha-1). Hence, a novel calibration approach adopted in this study improved the module's accuracy, while improving the

关键词： Sugarcane process-based modeling ECOSMOS

来源：评论

学校读者我要写书评

暂无评论

Accuracy, realism and general applicability of European forest models

引用

GLOBAL CHANGE BIOLOGY 2022年第23期28卷 6921-6943页

作者： Mahnken, Mats Cailleret, Maxime Collalti, Alessio Trotta, Carlo Biondo, Corrado D'Andrea, Ettore Dalmonech, Daniela Marano, Gina Makela, Annikki Minunno, Francesco Peltoniemi, Mikko Trotsiuk, Volodymyr Nadal-Sala, Daniel Sabate, Santiago Vallet, Patrick Aussenac, Raphael Cameron, David R. Bohn, Friedrich J. Grote, Ruediger Augustynczik, Andrey L. D. Yousefpour, Rasoul Huber, Nica Bugmann, Harald Merganicova, Katarina Merganic, Jan Valent, Peter Lasch-Born, Petra Hartig, Florian del Valle, Iliusi D. Vega Volkholz, Jan Gutsch, Martin Matteucci, Giorgio Krejza, Jan Ibrom, Andreas Meesenburg, Henning Roetzer, Thomas van der Maaten-Theunissen, Marieke van der Maaten, Ernst Reyer, Christopher P. O. Potsdam Inst Climate Impact Res PIK Leibniz Assoc D-14473 Potsdam Germany Tech Univ Dresden Forest Growth & Woody Biomass Prod Tharandt Germany Aix Marseille Univ INRAE UMR RECOVER Aix En Provence France Swiss Fed Res Inst WSL Forest Dynam Unit Birmensdorf Switzerland Natl Res Council Italy Inst Agr & Forestry Syst Mediterranean CNR ISAFOM Forest Modelling Lab Perugia Italy Univ Tuscia Dept Innovat Biol Agrofood & Forest Syst DIBAF Viterbo Italy Fdn Ctr Euromediterraneo Cambiamenti Climat Div Impacts Agr Forests & Ecosyst Serv IAFES Viterbo Italy Swiss Fed Inst Technol Inst Terr Ecosyst Dept Environm Syst Sci Forest Ecol Zurich Switzerland Univ Helsinki Inst Atmospher & Earth Syst Res INAR Dept Forest Sci Helsinki Finland Univ Helsinki Fac Agr & Forestry Helsinki Finland Nat Resources Inst Finland Luke Helsinki Finland Karlsruhe Inst Technol KIT Inst Meteorol & Climate Res Atmospher Environm Re Garmisch Partenkirchen Germany Univ Barcelona UB Dept Evolutionary Biol Ecol & Environm Sci Ecol Sect Barcelona Spain CREAF Ctr Ecol Res & Forestry Applicat Cerdanyola Del Valles Spain Univ Grenoble Alpes INRAE LESSEM St Martin Dheres France UK Ctr Ecol & Hydrol Penicuik Midlothian Scotland UFZ Helmholtz Ctr Environm Res Leipzig Germany Int Inst Appl Syst Anal IIASA Laxenburg Austria Univ Freiburg Forestry Econ & Forest Planning Freiburg Germany Univ Toronto John Daniels Fac Architecture Landscape & Design Inst Forestry & Conservat Toronto ON Canada Swiss Fed Res Inst WSL Remote Sensing Birmensdorf Switzerland Czech Univ Life Sci Prague Fac Forestry & Wood Sci Prague Czech Republic Slovak Acad Sci Inst Landscape Ecol Dept Biodivers Ecosyst & Landscape Nitra Slovakia Tech Univ Zvolen Fac Forestry Zvolen Slovakia Univ Regensburg Theoret Ecol Regensburg Germany CAS Global Change Res Inst Brno Czech Republic Mendel Univ Brno Dept Forest Ecol Brno Czech Republic Tech Univ Denmark DTU Dept Environm Engn Lyngby Denmark Northwest German Fores

Forest models are instrumental for understanding and projecting the impact of climate change on forests. A considerable number of forest models have been developed in the last decades. However, few systematic and comprehensive model comparisons have been performed in Europe that combine an evaluation of modelled carbon and water fluxes and forest structure. We evaluate 13 widely used, state-of-the-art, stand-scale forest models against field measurements of forest structure and eddy-covariance data of carbon and water fluxes over multiple decades across an environmental gradient at nine typical European forest stands. We test the models' performance in three dimensions: accuracy of local predictions (agreement of modelled and observed annual data), realism of environmental responses (agreement of modelled and observed responses of daily gross primary productivity to temperature, radiation and vapour pressure deficit) and general applicability (proportion of European tree species covered). We find that multiple models are available that excel according to our three dimensions of model performance. For the accuracy of local predictions, variables related to forest structure have lower random and systematic errors than annual carbon and water flux variables. Moreover, the multi-model ensemble mean provided overall more realistic daily productivity responses to environmental drivers across all sites than any single individual model. The general applicability of the models is high, as almost all models are currently able to cover Europe's common tree species. We show that forest models complement each other in their response to environmental drivers and that there are several cases in which individual models outperform the model ensemble. Our framework provides a first step to capturing essential differences between forest models that go beyond the most commonly used accuracy of predictions. Overall, this study provides a point of reference for future model work aimed at

关键词： eddy-covariance gap model model ensemble model evaluation process-based modeling terrestrial carbon dynamics

来源：评论

学校读者我要写书评

暂无评论

It takes a few to tango: changing climate and fire regimes can cause regeneration failure of two subalpine conifers

引用

ECOLOGY 2018年第4期99卷 966-977页

作者： Hansen, Winslow D. Braziunas, Kristin H. Rammer, Werner Seidl, Rupert Turner, Monica G. Univ Wisconsin Dept Integrat Biol Madison WI 53706 USA Univ Nat Resources & Life Sci BOKU Dept Forest & Soil Sci Inst Silviculture Vienna Austria

Environmental change is accelerating in the 21st century, but how multiple drivers may interact to alter forest resilience remains uncertain. In forests affected by large high-severity disturbances, tree regeneration is a resilience linchpin that shapes successional trajectories for decades. We modeled stands of two widespread western U.S. conifers, Douglas-fir (Pseudotsuga menziesii var. glauca), and lodgepole pine (Pinus contorta var. latifolia), in Yellowstone National Park (Wyoming, USA) to ask (1) What combinations of distance to seed source, fire return interval, and warming-drying conditions cause postfire tree-regeneration failure? (2) If postfire tree regeneration was successful, how does early tree density differ under future climate relative to historical climate? We conducted a stand-level (1ha) factorial simulation experiment using the individual-based forest process model iLand to identify combinations of fire return interval (11-100yr), distance to seed source (50-1,000m), and climate (historical, mid-21st century, late-21st century) where trees failed to regenerate by 30-yr postfire. If regeneration was successful, we compared stand densities between climate periods. Simulated postfire regeneration were surprisingly resilient to changing climate and fire drivers. Douglas-fir regeneration failed more frequently (55%) than lodgepole pine (28% and 16% for non-serotinous and serotinous stands, respectively). Distance to seed source was an important driver of regeneration failure for Douglas-fir and non-serotinous lodgepole pine;regeneration never failed when stands were 50m from a seed source and nearly always failed when stands were 1km away. Regeneration of serotinous lodgepole pine only failed when fire return intervals were 20yr and stands were far (1km) from a seed source. Warming climate increased regeneration success for Douglas-fir but did not affect lodgepole pine. If regeneration was successful, postfire density varied with climate. Douglas-fir

关键词： climate change drought forest resilience process-based modeling seedling establishment succession wildfire Yellowstone National Park

来源：评论

学校读者我要写书评

暂无评论

modeling the Cross-Sectional Dynamics of Tidal Sandbanks in Sediment-Scarce Conditions

引用

JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 2024年第4期129卷

作者： van Veelen, T. J. Roos, P. C. Hulscher, S. J. M. H. Univ Twente Marine & Fluvial Syst Enschede Netherlands

Tidal sandbanks are large-scale dynamic bedforms that consist of sandy sediment. They have been observed in shallow seas with varying sediment supply, including sediment-scarce environments like the Flemish Banks, Zeeland Banks, and Norfolk Banks. However, we do not yet understand how scarcity affects sandbank evolution. Therefore, we have developed an idealized nonlinear process-based model with the aim of studying cross-sectional shape and migration under sediment-scarce conditions. Scarcity is included through a non-erodible layer from which no sediment can be entrained. Our results show that bank height and width decrease when the sediment budget decreases. The bank height is more sensitive to scarcity than bank width. Furthermore, sand scarcity decreases (and may even reverse) bank asymmetry and increases migration rate when a residual current is present. The migration rate attains a maximum for a specific sediment budget, which is controlled by the ratio of the cross-sectional area of the sandbank and the tide-averaged sediment flux. Our findings show that sandbank dynamics are strongly affected by scarcity, which is critical for seas with receding sediment stocks (e.g., through extraction). Sandbanks are large-scale bodies of sand with rhythmic crests and troughs found in shallow seas. They grow in size due to the interaction of the tidal flow with the sand on the seabed until they eventually reach an equilibrium shape. They may also migrate when the tidal flow is asymmetric. Observations in the North Sea have revealed that sandbanks still exist when sand is scarce, but we do not yet understand how scarcity affects the equilibrium shape and the migration rate. Therefore, we have developed a mathematical model that simulates bank evolution of a small bank until equilibrium under increasingly scarce conditions. We find that sand scarcity leads to lower and slightly narrower sandbanks. The asymmetry of the shape also changes. The cross-section is skewed towards

关键词： tidal sandbanks sediment scarcity equilibrium dynamics cross-sectional shape migration process-based modeling

来源：评论

学校读者我要写书评

暂无评论

Hillslope topography from unconstrained photographs

引用

MATHEMATICAL GEOLOGY 2002年第8期34卷 929-952页

作者： Heimsath, AM Farid, H Dartmouth Coll Dept Earth Sci Hanover NH 03755 USA Dartmouth Coll Dept Comp Sci Hanover NH 03755 USA

Quantifications of Earth surface topography are essential for modeling the connections between physical and chemical processes of erosion and the shape of the landscape. Enormous investments are made in developing and testing process-based landscape evolution models. These models may never be applied to real topography because of the difficulties in obtaining high-resolution (1-2 m) topographic data in the form of digital elevation models (DEMs). Here we present a simple methodology to extract the high-resolution three-dimensional topographic surface from photographs taken with a hand-held camera with no constraints imposed on the camera positions or field survey. This technique requires only the selection of corresponding points in three or more photographs. From these corresponding points the unknown camera positions and surface topography are simultaneously estimated. We compare results from surface reconstructions estimated from high-resolution survey data from field sites in the Oregon Coast Range and northern California to verify our technique. Our most rigorous test of the algorithms presented here is from the soil-mantled hillslopes of the Santa Cruz marine terrace sequence. Results from three unconstrained photographs yield an estimated surface, with errors on the order of 1 m, that compares well with high-resolution GPS survey data and can be used as an input DEM in process-based landscape evolution modeling.

关键词： landscape evolution geomorphology process-based modeling digital elevation model (DEM) photogrammetry structure from motion

来源：评论

学校读者我要写书评

暂无评论

Global soil nitrous oxide emissions since the preindustrial era estimated by an ensemble of terrestrial biosphere models: Magnitude, attribution, and uncertainty

引用

GLOBAL CHANGE BIOLOGY 2019年第2期25卷 640-659页

作者： Tian, Hanqin Yang, Jia Xu, Rongting Lu, Chaoqun Canadell, Josep G. Davidson, Eric A. Jackson, Robert B. Arneth, Almut Chang, Jinfeng Ciais, Philippe Gerber, Stefan Ito, Akihiko Joos, Fortunat Lienert, Sebastian Messina, Palmira Olin, Stefan Pan, Shufen Peng, Changhui Saikawa, Eri Thompson, Rona L. Vuichard, Nicolas Winiwarter, Wilfried Zaehle, Soenke Zhang, Bowen Auburn Univ Sch Forestry & Wildlife Sci Int Ctr Climate & Global Change Res Auburn AL 36849 USA Chinese Acad Sci Res Ctr Ecoenvironm Sci State Key Lab Urban & Reg Ecol Beijing Peoples R China Mississippi State Univ Dept Forestry Mississippi State MS 39762 USA Iowa State Univ Dept Ecol Evolut & Organismal Biol Ames IA USA CSIRO Oceans & Atmosphere Global Carbon Project Canberra ACT Australia Univ Maryland Appalachian Lab Ctr Environm Sci Frostburg MD USA Stanford Univ Dept Earth Syst Sci Woods Inst Environm Stanford CA 94305 USA Stanford Univ Precourt Inst Energy Stanford CA 94305 USA Karlsruhe Inst Technol Inst Meteorol & Climate Res Atmospher Environm Re Garmisch Partenkirchen Germany LSCE Gif Sur Yvette France Univ Florida IFAS Soil & Water Sci Dept Gainesville FL 32611 USA Natl Inst Environm Studies Ctr Global Environm Res Tsukuba Ibaraki Japan Univ Bern Climate & Environm Phys Inst Phys Bern Switzerland Univ Bern Oeschger Ctr Climate Change Res Bern Switzerland Lund Univ Dept Phys Geog & Ecosyst Sci Lund Sweden Univ Quebec Montreal UQAM Dept Biol Sci Montreal PQ Canada Emory Univ Dept Environm Sci Atlanta GA 30322 USA Norsk Inst Luftforskning NILU Kjeller Norway Int Inst Appl Syst Anal Air Qual & Greenhouse Gases AIR Laxenburg Austria Univ Zielona Gora Inst Environm Engn Zielona Gora Poland Max Planck Inst Biogeochem Jena Germany CEREA Marne La Vallee France

Our understanding and quantification of global soil nitrous oxide (N2O) emissions and the underlying processes remain largely uncertain. Here, we assessed the effects of multiple anthropogenic and natural factors, including nitrogen fertilizer (N) application, atmospheric N deposition, manure N application, land cover change, climate change, and rising atmospheric CO2 concentration, on global soil N2O emissions for the period 1861-2016 using a standard simulation protocol with seven process-based terrestrial biosphere models. Results suggest global soil N2O emissions have increased from 6.3 +/- 1.1 Tg N2O-N/year in the preindustrial period (the 1860s) to 10.0 +/- 2.0 Tg N2O-N/year in the recent decade (2007-2016). Cropland soil emissions increased from 0.3 Tg N2O-N/year to 3.3 Tg N2O-N/year over the same period, accounting for 82% of the total increase. Regionally, China, South Asia, and Southeast Asia underwent rapid increases in cropland N2O emissions since the 1970s. However, US cropland N2O emissions had been relatively flat in magnitude since the 1980s, and EU cropland N2O emissions appear to have decreased by 14%. Soil N2O emissions from predominantly natural ecosystems accounted for 67% of the global soil emissions in the recent decade but showed only a relatively small increase of 0.7 +/- 0.5 Tg N2O-N/year (11%) since the 1860s. In the recent decade, N fertilizer application, N deposition, manure N application, and climate change contributed 54%, 26%, 15%, and 24%, respectively, to the total increase. Rising atmospheric CO2 concentration reduced soil N2O emissions by 10% through the enhanced plant N uptake, while land cover change played a minor role. Our estimation here does not account for indirect emissions from soils and the directed emissions from excreta of grazing livestock. To address uncertainties in estimating regional and global soil N2O emissions, this study recommends several critical strategies for improving the process-based simulations.

关键词： global nitrogen cycle greenhouse gas emission nitrous oxide process-based modeling soil N2O emission

来源：评论

学校读者我要写书评

暂无评论

Morphodynamic Evolution of a Fringing Sandy Shoal: From Tidal Levees to Sea Level Rise

引用

JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 2020年第6期125卷 e2019JF005397-e2019JF005397页

作者： Elmilady, H. van der Wegen, M. Roelvink, D. van der Spek, A. IHE Delft Inst Water Educ Delft Netherlands Deltares Delft Netherlands Delft Univ Technol Fac Civil Engn & Geosci Delft Netherlands Univ Utrecht Fac Geosci Utrecht Netherlands

Intertidal shoals are vital components of estuaries. Tides, waves, and sediment supply shape the profile of estuarine shoals. Ensuring their sustainability requires an understanding of how such systems will react to sea level rise (SLR). In contrast to mudflats, sandy shoals have drawn limited attention in research. Inspired by a channel-shoal system in the Western Scheldt Estuary (Netherlands), this research investigates governing processes of the long-term morphodynamic evolution of intertidal estuarine sandy shoals across different timescales. We apply a high-resolution process-based numerical model (Delft3D) to generate a channel-shoal system in equilibrium and expose the equilibrium profile to variations in wave forcing and SLR. Combined tidal action and wave forcing initiate ridge formation at the seaward shoal edge, which slowly propagates landward until a linear equilibrium profile develops within 200 years. Model simulations in which forcing conditions have been varied to reproduce observations show that the bed is most dynamic near the channel-shoal interface. A decrease/increase in wave forcing causes the formation/erosion of small tidal levees at the shoal edge, which shows good resemblance to observed features. The profile recovers when regular wave forcing applies again. Sandy shoals accrete in response to SLR with a long (decades) bed-level adaptation lag eventually leading to intertidal area loss. This lag depends on the forcing conditions and is lowest near the channel and gradually increases landward. Adding mud makes the shoal more resilient to SLR. Our study suggests that processes near the channel-shoal interface are crucial to understanding the long-term morphodynamic development of sandy shoals. Plain Language Summary Intertidal area is the coastal zone that undergoes a rhythm of wet-dry cycles under the influence of tidal action. Intertidal shoals are vital components of the estuarine environment. They have high ecological value but also help

关键词： Intertidal sandy shoals Long-term estuarine morphodynamics process-based modeling Waves Tidal levees Sea-level rise

来源：评论

学校读者我要写书评

暂无评论

The role of river flow and tidal asymmetry on 1-D estuarine morphodynamics

引用

JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE 2014年第11期119卷 2315-2334页

作者： Guo, L. van der Wegen, M. Roelvink, J. A. He, Q. E China Normal Univ State Key Lab Estuarine & Coastal Res Shanghai 200062 Peoples R China UNESCO IHE Delft Netherlands Deltares Delft Netherlands Delft Univ Technol Civil Engn & Geosci Fac Delft Netherlands

Numerous research efforts have been devoted to understanding estuarine morphodynamics under tidal forcing. However, the impact of river discharge on estuarine morphodynamics is insufficiently examined. Inspired by the Yangtze Estuary, this work explores the morphodynamic impact of river discharge in a 560 km long tidal basin based on a 1-D model (Delft3D). The model considers total load sediment transport and employs a morphodynamic updating scheme to achieve long-term morphodynamic evolution. We analyze the role of Stokes drift, tidal asymmetry, and river discharge in generating tidal residual sediment transport. Model results suggest that morphodynamic equilibrium is approached within millennia by vanishing spatial gradients of tidal residual sediment transport. We find that the interaction between ebb-directed Stokes return flow/river flow with tides is an important mechanism that flushes river-supplied sediment seaward. Increasing river discharge does not induce continuously eroded or accreted equilibrium bed profiles because of the balance between riverine sediment supply and sediment flushing to the sea. An intermediate threshold river discharge can be defined which leads to a deepest equilibrium bed profile. As a result, the shape (concavity or convexity) of the equilibrium bed profiles will adapt with the magnitude of river discharge. Overall, this study reveals the significant role of river discharge in controlling estuarine morphodynamics by supplying sediment and reinforcing ebb-directed residual sediment transport.

关键词： estuarine morphodynamics process-based modeling residual sediment transport equilibrium profiles

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：