scholarly journals Coastal Modelling Environment version 1.0: a framework for integrating landform-specific component models in order to simulate decadal to centennial morphological changes on complex coasts

2017 ◽  
Vol 10 (7) ◽  
pp. 2715-2740 ◽  
Author(s):  
Andrés Payo ◽  
David Favis-Mortlock ◽  
Mark Dickson ◽  
Jim W. Hall ◽  
Martin D. Hurst ◽  
...  
Keyword(s):  
Morphological Changes ◽  
Simulation Models ◽  
Coastal Structures ◽  
Coastal Morphology ◽  
Novel Approach ◽  
Coastal Modelling ◽  
Coupling Approach ◽  
Modelling Environment ◽  
Alongshore Sediment Transport ◽  
Component Models

Abstract. The ability to model morphological changes on complex, multi-landform coasts over decadal to centennial timescales is essential for sustainable coastal management worldwide. One approach involves coupling of landform-specific simulation models (e.g. cliffs, beaches, dunes and estuaries) that have been independently developed. An alternative, novel approach explored in this paper is to capture the essential characteristics of the landform-specific models using a common spatial representation within an appropriate software framework. This avoid the problems that result from the model-coupling approach due to between-model differences in the conceptualizations of geometries, volumes and locations of sediment. In the proposed framework, the Coastal Modelling Environment (CoastalME), change in coastal morphology is represented by means of dynamically linked raster and geometrical objects. A grid of raster cells provides the data structure for representing quasi-3-D spatial heterogeneity and sediment conservation. Other geometrical objects (lines, areas and volumes) that are consistent with, and derived from, the raster structure represent a library of coastal elements (e.g. shoreline, beach profiles and estuary volumes) as required by different landform-specific models. As a proof-of-concept, we illustrate the capabilities of an initial version of CoastalME by integrating a cliff–beach model and two wave propagation approaches. We verify that CoastalME can reproduce behaviours of the component landform-specific models. Additionally, the integration of these component models within the CoastalME framework reveals behaviours that emerge from the interaction of landforms, which have not previously been captured, such as the influence of the regional bathymetry on the local alongshore sediment-transport gradient and the effect on coastal change on an undefended coastal segment and on sediment bypassing of coastal structures.

scholarly journals CoastalME version 1.0: a Coastal Modelling Environment for simulating decadal to centennial morphological changes

2016 ◽  
Author(s):  
Andrés Payo ◽  
David Favis-Mortlock ◽  
Mark Dickson ◽  
Jim W. Hall ◽  
Martin Hurst ◽  
...  
Keyword(s):  
Morphological Changes ◽  
Specific Model ◽  
Proof Of Concept ◽  
Software Environment ◽  
Coastal Morphology ◽  
Novel Approach ◽  
Coastal Modelling ◽  
Modelling Environment ◽  
Alongshore Sediment Transport ◽  
Framework Development

Abstract. Modelling coastal morphological changes at decadal to centennial time scales is required to support sustainable coastal management world-wide. One approach involves coupling of landform-specific components (e.g. cliff, beach, dunes, estuaries, etc.) that have been independently developed. An alternative, and novel approach explored in this paper is to capture the essential characteristics of the landform-specific models using a common spatial representation within an appropriate software-environment. In the proposed Coastal Modelling Environment (CoastalME), change in coastal morphology is formulated by means of dynamically linked raster and geometrical objects. A grid of raster cells provides the data structure for representing quasi-3D spatial heterogeneity and sediment conservation. Other geometrical objects (lines, areas and volumes) that are consistent with, and derived from, the raster structure represent a library of coastal elements (e.g. shoreline, beach profiles and estuary volumes) as required by different landform-specific models. As a proof-of-concept, we illustrate the potential capabilities of CoastalME by integrating a cliff-beach model. We verify that CoastalME can reproduce behaviours of each individual landform-specific model. Their integration within the framework of CoastalME reveals behaviours that emerge from landforms interaction and which have not previously been captured, such as the influence of the regional bathymetry on the local alongshore sediment transport gradient. This is the first step of the framework development, which provides an alternative to directly coupling existing models.

Assessment on Morphological Changes due to Coastal Exploitations and Remedies for Coastal Defense

2017 ◽  
Author(s):  
Wei-Po Huang ◽  
Lien-Kwei Chien ◽  
Cheng-Yu Ku
Keyword(s):  
Morphological Changes ◽  
Sustainable Use ◽  
Beach Nourishment ◽  
Coastal Structures ◽  
Remedial Measure ◽  
Coastal Morphology ◽  
Local Erosion ◽  
Coastal Defense ◽  
Coastal Exploitation ◽  
Biological Environment

This study evaluates the influence of coastal structures on coastal morphology near Hsin-Chu fishery harbor in the northwest of Taiwan. As a result, the downdrift side has undergone local erosion due to the longshore sediment was impounded at updrift breakwaters resulting the enhancement of coastal flood risks as well as deterioration of the biological environment. Process and trend analyses were used to assess the effects the coastal exploitation made on the coastal morphology. Environmentally-friendly remedial measure, beach nourishment is proposed. The sediment source supply and the location of beach nourishment were also suggested for achieving the goal of sustainable use in the area.

Synthesis of Multi-Substituted Bicycloalkyl Boronates: An Intramolecular Coupling Approach to Alkyl Bioisosteres

2021 ◽  
Author(s):  
Yangyang Yang ◽  
Jet Tsien ◽  
Jonathan Hughes ◽  
Byron Peters ◽  
Rohan Merchant ◽  
...  
Keyword(s):  
Intramolecular Cyclization ◽  
Material Chemistry ◽  
Novel Approach ◽  
Coupling Approach ◽  
New Type ◽  
Strain Release ◽  
Synthetic Studies ◽  
Bicyclic Molecules

<p>Bicyclic hydrocarbons, bicyclo[1.1.1]pentanes (BCPs) in particular, play an emerging role as saturated bioisosteres in pharmaceutical, agrochemical, and material chemistry. Taking advantage of strain release strategies, prior synthetic studies have featured the synthesis of bridgehead-substituted (C1, C3) BCPs from [1.1.1]propellane. This work describes a novel approach to accessing multi-substituted BCPs via a new type of intramolecular cyclization. In addition to the C1, C3-disubstituted BCPs, this method also enables the construction of yet underexplored tri-substituted (C1, C2 and C3) BCPs from readily accessible cyclobutanones. The broad generality of this cyclization is examined through synthesis of a variety of caged bicyclic molecules, ranging from [1.1.1] to [3.2.1] scaffolds. The modularity afforded by the pendant bridgehead Bpin resulted from the cyclization is demonstrated via several downstream functionalizations, highlighting the ability of this approach for programmed and divergent synthesis of multi-substituted bicyclic hydrocarbons.<br></p>

DEVS-Based Simulation Interoperability

2012 ◽  
pp. 377-393
Author(s):  
Thomas Wutzler ◽  
Hessam Sarjoughian
Keyword(s):  
Programming Languages ◽  
Real World ◽  
Formal Model ◽  
Simulation Models ◽  
Carbon Accounting ◽  
Model Specification ◽  
Abstract Model ◽  
Conceptual Basis ◽  
Accounting Model ◽  
Component Models

This chapter introduces the usage of DEVS for the purpose of implementing interoperability across heterogeneous simulation models. It shows that the DEVS framework provides a simple, yet effective conceptual basis for handling simulation interoperability. It discusses the various useful properties of the DEVS framework, describes the Shared Abstract Model (SAM) approach for interoperating simulation models, and compares it to other approaches. The DEVS approach enables formal model specification with component models implemented in multiple programming languages. The simplicity of the integration of component models designed in the DEVS, DTSS, and DESS simulation formalisms and implemented in the programming languages Java and C++ is demonstrated by a basic educational example and by a real world forest carbon accounting model. The authors hope, that readers will appreciate the combination of generalness and simplicity and that readers will consider using the DEVS approach for simulation interoperability in their own projects.

scholarly journals Water–Energy–Food Nexus Simulation: An Optimization Approach for Resource Security

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 667 ◽  
Author(s):  
Albert Wicaksono ◽  
Gimoon Jeong ◽  
Doosun Kang
Keyword(s):  
Resource Management ◽  
Simulation Models ◽  
Decision Support Tool ◽  
Limited Resources ◽  
Optimization Approach ◽  
Support Tool ◽  
Sustainable Resource Management ◽  
Novel Approach ◽  
Management Plans ◽  
Optimal Resource

The water–energy–food nexus (WEF nexus) concept is a novel approach to manage limited resources. Since 2011, a number of studies were conducted to develop computer simulation models quantifying the interlinkage among water, energy, and food sectors. Advancing a nationwide WEF nexus simulation model (WEFSiM) previously developed by the authors, this study proposes an optimization module (WEFSiM-opt) to assist stakeholders in making informed decisions concerning sustainable resource management. Both single- and multi-objective optimization modules were developed to maximize the user reliability index (URI) for water, energy, and food sectors by optimizing the priority index and water allocation decisions. In this study, the developed models were implemented in Korea to determine optimal resource allocation and management decisions under a plausible drought scenario. This study suggests that the optimization approach can advance WEF nexus simulation and provide better solutions for managing limited resources. It is anticipated that the proposed WEFSiM-opt can be utilized as a decision support tool for designing resource management plans.

Resource Allocation for Reduction of Epistemic Uncertainty in Simulation-Based Multidisciplinary Design

2015 ◽  
Author(s):  
Zhen Jiang ◽  
Shishi Chen ◽  
Daniel W. Apley ◽  
Wei Chen
Keyword(s):  
Resource Allocation ◽  
Epistemic Uncertainty ◽  
Complex Structure ◽  
Simulation Models ◽  
Multidisciplinary Design ◽  
Input Space ◽  
Novel Approach ◽  
Critical Responses ◽  
Reliable Design ◽  
Multidisciplinary System

Epistemic model uncertainty is a significant source of uncertainty that affects a multidisciplinary system. In order to achieve a reliable design, it is critical to ensure that the disciplinary/subsystem simulation models are trustworthy, so that the aggregated uncertainty of system quantities of interest (QOIs) is acceptable. Uncertainty reduction can be achieved by gathering additional experiments and simulations data; however resource allocation for multidisciplinary design optimization (MDO) remains a challenging task due to the complex structure of a multidisciplinary system. In this paper, we develop a novel approach by integrating multidisciplinary uncertainty analysis (MUA) and multidisciplinary statistical sensitivity analysis (MSSA) to answer the questions about where (sampling locations), what (disciplinary responses), and which (simulations versus experiments) for allocating more resources. To manage the complexity in making the above decisions, a sequential procedure is proposed. First, the input space of a multidiscipline system is explored to identify the locations with unacceptable amounts of uncertainty with respect to the system QOIs. Next, these input locations are selected through a correlation check so that they are sparsely located in the input space, and their corresponding critical responses are identified based on MSSA. Finally, using a preposterior analysis, decisions are made about what type of resources (experimental or computational) should be allocated to the critical responses at the chosen input locations. The proposed method is applied to a benchmark electronic packaging problem to demonstrate how epistemic uncertainty is gradually reduced via gathering more data.

Physical and Morphological Changes to Wetlands Induced by Coastal Structures

2017 ◽  
pp. 275-315 ◽  
Author(s):  
Germán Daniel Rivillas-Ospina ◽  
Gabriel Ruiz-Martinez ◽  
Rodolfo Silva ◽  
Edgar Mendoza ◽  
Carlos Pacheco ◽  
...  
Keyword(s):  
Morphological Changes ◽  
Coastal Structures

COASTAL ENGINEERING 2002

2002 ◽  
Vol 1 (28) ◽  
Author(s):  
Jane McKee Smith
Keyword(s):  
Sediment Transport ◽  
Coastal Management ◽  
Physical Modeling ◽  
State Of The Art ◽  
Field Measurements ◽  
Coastal Engineering ◽  
Coastal Processes ◽  
Coastal Structures ◽  
Coastal Morphology ◽  
Coastal Waves

*** Available Only Through World Scientific *** http://www.worldscibooks.com/engineering/5165.html This book contains more than 300 papers presented at the 28th International Conference on Coastal Engineering, held in Cardiff, Wales, in July 2002. It is divided into five parts: coastal waves; nearshore currents, swash, and long waves; coastal structures; sediment transport; and coastal morphology, beach nourishment, and coastal management. The papers cover a broad range of topics, including theory, numerical and physical modeling, field measurements, case studies, design, and management. Coastal Engineering 2002 provides engineers, scientists, and planners with state-of-the-art information on coastal engineering and coastal processes.

scholarly journals Coastal vulnerability of a pinned, soft-cliff coastline, II: assessing the influence of sea walls on future morphology

2014 ◽  
Vol 2 (1) ◽  
pp. 233-242 ◽  
Author(s):  
A. Barkwith ◽  
M. D. Hurst ◽  
C. W. Thomas ◽  
M. A. Ellis ◽  
P. L. Limber ◽  
...  
Keyword(s):  
Coastal Erosion ◽  
Morphological Changes ◽  
Numerical Models ◽  
Field Research ◽  
Wave Climate ◽  
Sediment Flux ◽  
Climate Data ◽  
Coastal Morphology ◽  
Coastal Evolution ◽  
The Impact

Abstract. Coastal defences have long been employed to halt or slow coastal erosion, and their impact on local sediment flux and ecology has been studied in detail through field research and numerical simulation. The non-local impact of a modified sediment flux regime on mesoscale erosion and accretion has received less attention. Morphological changes at this scale due to defending structures can be difficult to quantify or identify with field data. Engineering-scale numerical models, often applied to assess the design of modern defences on local coastal erosion, tend not to cover large stretches of coast and are rarely applied to assess the impact of older structures. We extend previous work to explore the influences of sea walls on the evolution and morphological sensitivity of a pinned, soft-cliff, sandy coastline under a changing wave climate. The Holderness coast of East Yorkshire, UK, is used as a case study to explore model scenarios where the coast is both defended with major sea walls and allowed to evolve naturally were there are no sea defences. Using a mesoscale numerical coastal evolution model, observed wave-climate data are perturbed linearly to assess the sensitivity of the coastal morphology to changing wave climate for both the defended and undefended scenarios. Comparative analysis of the simulated output suggests that sea walls in the south of the region have a greater impact on sediment flux due to increased sediment availability along this part of the coast. Multiple defence structures, including those separated by several kilometres, were found to interact with each other, producing complex changes in coastal morphology under a changing wave climate. Although spatially and temporally heterogeneous, sea walls generally slowed coastal recession and accumulated sediment on their up-drift side.

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