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Relevant bibliographies by topics / Chen system

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Academic literature on the topic 'Chen system'

Author: Grafiati

Published: 28 June 2021

Last updated: 17 February 2022

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Journal articles on the topic "Chen system"

1

Llibre, Jaume, and Ana Rodrigues. "On the Dynamics of the Unified Chaotic System Between Lorenz and Chen Systems." International Journal of Bifurcation and Chaos 25, no. 09 (August 2015): 1550122. http://dx.doi.org/10.1142/s0218127415501229.

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A one-parameter family of differential systems that bridges the gap between the Lorenz and the Chen systems was proposed by Lu, Chen, Cheng and Celikovsy. The goal of this paper is to analyze what we can say using analytic tools about the dynamics of this one-parameter family of differential systems. We shall describe its global dynamics at infinity, and for two special values of the parameter a we can also describe the global dynamics in the whole ℝ3using the invariant algebraic surfaces of the family. Additionally we characterize the Hopf bifurcations of this family.

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ELABBASY, E. M., H. N. AGIZA, and M. M. EL-DESSOKY. "SYNCHRONIZATION OF MODIFIED CHEN SYSTEM." International Journal of Bifurcation and Chaos 14, no. 11 (November 2004): 3969–79. http://dx.doi.org/10.1142/s0218127404011740.

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This paper addresses the synchronization problem of two modified Chen systems in the presence of unknown system parameters. One-way coupling and active control laws are applied to achieve the state synchronization of two identical modified Chen systems. Based on Lyapunov stability theory, active control laws are derived such that the two modified Chen systems are to be synchronized. Numerical simulations results are used to demonstrate the effectiveness of the proposed control methods.

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LÜ, JINHU, GUANRONG CHEN, DAIZHAN CHENG, and SERGEJ CELIKOVSKY. "BRIDGE THE GAP BETWEEN THE LORENZ SYSTEM AND THE CHEN SYSTEM." International Journal of Bifurcation and Chaos 12, no. 12 (December 2002): 2917–26. http://dx.doi.org/10.1142/s021812740200631x.

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This paper introduces a unified chaotic system that contains the Lorenz and the Chen systems as two dual systems at the two extremes of its parameter spectrum. The new system represents the continued transition from the Lorenz to the Chen system and is chaotic over the entire spectrum of the key system parameter. Dynamical behaviors of the unified system are investigated in somewhat detail.

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Aminikhah, H., A. Refahi Sheikhani, and H. Rezazadeh. "Stability Analysis of Distributed Order Fractional Chen System." Scientific World Journal 2013 (2013): 1–13. http://dx.doi.org/10.1155/2013/645080.

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We first investigate sufficient and necessary conditions of stability of nonlinear distributed order fractional system and then we generalize the integer-order Chen system into the distributed order fractional domain. Based on the asymptotic stability theory of nonlinear distributed order fractional systems, the stability of distributed order fractional Chen system is discussed. In addition, we have found that chaos exists in the double fractional order Chen system. Numerical solutions are used to verify the analytical results.

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Huang, Qiujian, Aimin Liu, and Yongjian Liu. "Jacobi Stability Analysis of the Chen System." International Journal of Bifurcation and Chaos 29, no. 10 (September 2019): 1950139. http://dx.doi.org/10.1142/s0218127419501396.

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In this paper, the research of the Jacobi stability of the Chen system is performed by using the KCC-theory. By associating a nonlinear connection and a Berwald connection, five geometrical invariants of the Chen system are obtained. The Jacobi stability of the Chen system at equilibrium points and a periodic orbit is investigated in terms of the eigenvalues of the deviation curvature tensor. The obtained results show that the origin is always Jacobi unstable, while the Jacobi stability of the other two nonzero equilibrium points depends on the values of the parameters. And a periodic orbit of the Chen system is proved to be also Jacobi unstable. Furthermore, Jacobi stability regions of the Chen system and the Lorenz system are compared. Finally, the dynamical behavior of the components of the deviation vector near the equilibrium points is also discussed.

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WANG, XINGYUAN, and XIANGJUN WU. "PARAMETER IDENTIFICATION AND ADAPTIVE SYNCHRONIZATION OF UNCERTAIN HYPERCHAOTIC CHEN SYSTEM." International Journal of Modern Physics B 22, no. 08 (March 30, 2008): 1015–23. http://dx.doi.org/10.1142/s0217979208039034.

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This paper studies the adaptive synchronization and parameter identification of an uncertain hyperchaotic Chen system. Based on the Lyapunov stability theory, an adaptive control law is derived to make the states of two identical hyperchaotic Chen systems asymptotically synchronized. With this approach, the synchronization and parameter identification of the hyperchaotic Chen system with five uncertain parameters can be achieved simultaneously. Theoretical proof and numerical simulations demonstrate the effectiveness and feasibility of the proposed scheme.

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MA, CHAO, and XINGYUAN WANG. "BRIDGE BETWEEN THE HYPERCHAOTIC LORENZ SYSTEM AND THE HYPERCHAOTIC CHEN SYSTEM." International Journal of Modern Physics B 25, no. 05 (February 20, 2011): 711–21. http://dx.doi.org/10.1142/s0217979211057967.

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This paper presents a novel unified hyperchaotic system that contains the hyperchaotic Lorenz system and the hyperchaotic Chen system as two dual systems at the two extremes of its parameter spectrum. The new system is hyperchaotic over almost the whole range of the system parameter and continuously transfers from the hyperchaotic Lorenz system to the hyperchaotic Chen system. The new findings are not only demonstrated by computer simulations but also verified with bifurcation analysis, Lyapunov exponents and Lyapunov dimension.

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Wu, Yan-Ping, and Guo-Dong Wang. "Synchronization between Fractional-Order and Integer-Order Hyperchaotic Systems via Sliding Mode Controller." Journal of Applied Mathematics 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/151025.

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The synchronization between fractional-order hyperchaotic systems and integer-order hyperchaotic systems via sliding mode controller is investigated. By designing an active sliding mode controller and choosing proper control parameters, the drive and response systems are synchronized. Synchronization between the fractional-order Chen chaotic system and the integer-order Chen chaotic system and between integer-order hyperchaotic Chen system and fractional-order hyperchaotic Rössler system is used to illustrate the effectiveness of the proposed synchronization approach. Numerical simulations coincide with the theoretical analysis.

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Zheng, Jie, Shao Juan Ma, and Duan Dong. "Chaos Control of the Fractional Order Stochastic Chen System." Advanced Materials Research 694-697 (May 2013): 2130–33. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.2130.

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In this paper, we study chaos control of the fractional order Chen system with the bounded random parameter. Firstly, we transform the fractional order Chen system with random parameter into an equivalent deterministic system by the orthogonal polynomial approximation. Secondly, based on Routh-Hrwitz criterion, the derivative feedback control laws are applied to fractional order equivalent deterministic Chen system. Lastly, numerical simulations show that the control method is effective and feasible.

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WANG, XIONG, and GUANRONG CHEN. "A GALLERY OF LORENZ-LIKE AND CHEN-LIKE ATTRACTORS." International Journal of Bifurcation and Chaos 23, no. 04 (April 2013): 1330011. http://dx.doi.org/10.1142/s0218127413300115.

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In this article, three-dimensional autonomous chaotic systems with two quadratic terms, similar to the Lorenz system in their algebraic forms, are studied. An attractor with two clearly distinguishable scrolls similar to the Lorenz attractor is referred to as a Lorenz-like attractor, while an attractor with more intertwine between the two scrolls similar to the Chen attractor is referred to as a Chen-like attractor. A gallery of Lorenz-like attractors and Chen-like attractors are presented. For several different families of such systems, through tuning only one real parameter gradually, each of them can generate a spectrum of chaotic attractors continuously changing from a Lorenz-like attractor to a Chen-like attractor. Some intrinsic relationships between the Lorenz system and the Chen system are revealed and discussed. Some common patterns of the Lorenz-like and Chen-like attractors are found and analyzed, which suggest that the instability of the two saddle-foci of such a system somehow determines the shape of its chaotic attractor. These interesting observations on the general dynamic patterns hopefully could shed some light for a better understanding of the intrinsic relationships between the algebraic structures and the geometric attractors of these kinds of chaotic systems.

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Dissertations / Theses on the topic "Chen system"

1

Si, Tou Wai Meng. "An Investigation of the dynamic behaviors of the chaotics Chen-Lee system." Thesis, University of Macau, 2007. http://umaclib3.umac.mo/record=b1694327.

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Chen, Chen [Verfasser], Alois [Akademischer Betreuer] Knoll, Heinz-Erich [Akademischer Betreuer] Wichmann, and Alexander [Akademischer Betreuer] Horsch. "A multimodal biosensor-based system with compatibility for telemonitoring and epidemiological services / Chen Chen. Betreuer: Alois Knoll. Gutachter: Alois Knoll ; Heinz-Erich Wichmann ; Alexander Horsch." München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/1097547566/34.

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Chen, Zhao [Verfasser], and N. [Akademischer Betreuer] Goldscheider. "Modeling a geologically complex karst aquifer system, Hochifen-Gottesacker, Alps / Zhao Chen ; Betreuer: N. Goldscheider." Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1136660852/34.

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Freier, Matthias [Verfasser], and J. J. [Akademischer Betreuer] Chen. "Analysis of Real-Time Capabilities of Dynamic Scheduled System / Matthias Freier. Betreuer: J.-J. Chen." Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/1113109300/34.

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Chen, Si [Verfasser], and Ana [Akademischer Betreuer] Martin-Villalba. "The CD95/CD95L signaling system in developmental and tumor angiogenesis of the central nervous system / Si Chen ; Betreuer: Ana Martin-Villalba." Heidelberg : Universitätsbibliothek Heidelberg, 2018. http://d-nb.info/1177688484/34.

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Chen, Yuling Verfasser], and Thomas [Akademischer Betreuer] [Jungbluth. "Biomethane production in an innovative two-phase pressurized anaerobic digestion system / Yuling Chen. Betreuer: Thomas Jungbluth." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2015. http://d-nb.info/1070580546/34.

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Yin, Qitao [Verfasser], and Li [Akademischer Betreuer] Chen. "Mean field limit of many particle system with non-Lipschitz force / Qitao Yin ; Betreuer: Li Chen." Mannheim : Universitätsbibliothek Mannheim, 2019. http://d-nb.info/1192664019/34.

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Chen, Yi-Ju. "A novel quantification of the relationship between blood sugar and stress / Y.J. Chen." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2633.

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Chen, Hans [Verfasser], and M. [Akademischer Betreuer] Heilmaier. "Gefüge und Eigenschaften von äquiatomaren Legierungen aus dem System Ta-Nb-Mo-Cr-Ti-Al / Hans Chen ; Betreuer: M. Heilmaier." Karlsruhe : KIT-Bibliothek, 2020. http://d-nb.info/1208296787/34.

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Chen, Tao [Verfasser], and Stefan van [Akademischer Betreuer] Waasen. "Model-driven development methodology applied to real-time MEG signal pre-processing system design / Tao Chen ; Betreuer: Stefan van Waasen." Duisburg, 2019. http://d-nb.info/1191692027/34.

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Books on the topic "Chen system"

1

Bachman, David M. Chen Yun and the Chinese political system. Berkeley, Calif: Institute of East Asian Studies, University of California, Berkeley, Center for Chinese Studies, 1985.

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Xi tong gong chen gli lun yu shi jian. Beijing Shi: Guo fang gong ye chu ban she, 2009.

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Hang tian chan pin gong cheng. Beijing Shi: Zhongguo yu hang chu ban she, 2011.

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Jun shi xi tong gong cheng. Beijing: Guo fang gong ye chu ban she, 2014.

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Xi tong gong cheng. [Hangzhou shi]: Zhejiang jiao yu chu ban she, 1986.

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Mian xiang chan pin chuang xin de guan li ji cheng li lun yu fang fa. Beijing: Ke xue chu ban she, 2009.

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7

scientist), Ma Weijun (Computer, ed. Xin xi xi tong ji cheng fang fa yu ji shu: Information System Integration Method and Technology. Beijing Shi: Qi xiang chu ban she, 2012.

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Wei xin xiao cheng xu: Chan pin + yun ying + tui guang shi zhan. Beijing: Qing hua da xue chu ban she, 2017.

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Gong cheng xi tong lun: Engineering System Theory. Beijing Shi: Zhongguo yu hang chu ban she, 2002.

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Zhuang bei bao zhang xing xi tong gong cheng: System supportability system engineering. Beijing Shi: Guo fang gong ye chu ban she, 2008.

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Book chapters on the topic "Chen system"

1

He, Hongjun, Yan Cui, Chenhui Lu, and Guan Sun. "Time Delay Chen System Analysis and Its Application." In Advances in Mechanical Design, 202–13. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9941-2_17.

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Liu, Zhen, Wen-Xian Xiao, Ji-Tian Wang, and Wen-Long Wan. "The Analysis of Fractional Chen Chaotic System Composite Structure." In Communications in Computer and Information Science, 571–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24999-0_79.

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Peng, Jun, and Shangzhu Jin. "Designing Key-Dependent S-Boxes Using Hyperchaotic Chen System." In Lecture Notes in Electrical Engineering, 733–40. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4856-2_89.

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Vaidyanathan, Sundarapandian. "Adaptive Controller and Synchronizer Design for the Qi-Chen Chaotic System." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 124–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27308-7_13.

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Rantala, Ari, and Daniel Kim. "Implementing Wireless Electrolytic Cell Monitoring System at Kennecott Utah Copper for Improved Operational Efficiency." In T.T. Chen Honorary Symposium on Hydrometallurgy, Electrometallurgy and Materials Characterization, 77–89. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118364833.ch6.

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Shaohua, Ju, Zhang Libo, Peng Jin-hui, Guo Sheng-hui, Xu Lei, Wang Xin, and Huang Meng-yang. "Extraction Impurities such as Fe, Ca and Mg from a Titanium Material in Chloride Acid System with Microwave Eenergy Leaching." In T.T. Chen Honorary Symposium on Hydrometallurgy, Electrometallurgy and Materials Characterization, 323–32. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118364833.ch29.

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Huang, Yongtao, Pengqi Yin, Jie Ma, and Rui Wang. "Physical Layer Encryption Based on Hyper-Chen Chaos in Universal Filtered Multi-carriers System." In Proceedings of the 11th International Conference on Modelling, Identification and Control (ICMIC2019), 33–39. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0474-7_4.

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Reinhardt, Ch A. "Das CHEN-Zellsystem (Chick Embryo Neural Cell System) für das Screening auf Neuro- und Entwicklungstoxikologie." In Ersatz- und Ergänzungsmethoden zu Tierversuchen, 368–70. Vienna: Springer Vienna, 1995. http://dx.doi.org/10.1007/978-3-7091-9418-8_79.

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Chen, Kuo-Tsai. "Expansion of Solutions of Differential Systems." In Collected Papers of K.-T. Chen, 177–93. Boston, MA: Birkhäuser Boston, 2001. http://dx.doi.org/10.1007/978-1-4612-2096-1_18.

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Chen, Kuo-Tsai. "Exact Dynamic Systems are Tree-Like and Vice Versa." In Collected Papers of K.-T. Chen, 343–49. Boston, MA: Birkhäuser Boston, 2001. http://dx.doi.org/10.1007/978-1-4612-2096-1_31.

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Conference papers on the topic "Chen system"

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Sa, Yuchao, and Wei He. "Chen-Mobius voice communication system." In 6th International Conference on Mechatronics, Materials, Biotechnology and Environment (ICMMBE 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icmmbe-16.2016.99.

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Guan jun Jia and Qun-h Zhang. "Impulsive synchronization of hyperchaotic Chen system." In 2008 Chinese Control and Decision Conference (CCDC). IEEE, 2008. http://dx.doi.org/10.1109/ccdc.2008.4598005.

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Naseri, E., A. Ranjbar, and S. H. HosseinNia. "Backstepping Control of Fractional-Order Chen System." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86950.

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In this paper, Chaos and its control is studied in fractional-order Chen system. Backstepping method is proposed to synchronize two identical fractional-order Chen systems. The simulation results show that this method can effectively synchronize two identical chaotic systems.

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Austin, Francis, Chen Xu, Jian-wen Feng, and Wei-qiang Zhang. "Adaptive Synchronization Between Hyperchaotic Lorenz System and Chen System." In 2009 International Conference on Computational Intelligence and Security (CIS 2009). IEEE, 2009. http://dx.doi.org/10.1109/cis.2009.122.

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GAMBINO, G., M. C. LOMBARDO, and M. SAMMARTINO. "AN EQUILIBRIUM POINT REGULARIZATION FOR THE CHEN SYSTEM." In Proceedings of the 13th Conference on WASCOM 2005. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773616_0033.

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Peng, Jun, Wu Yang, Shangzhu Jin, Shaoning Pang, Dedong Tang, Junjie Bai, and Du Zhang. "Image Encryption Based on Fractional-order Chen Hyperchaotic System." In 2020 15th IEEE Conference on Industrial Electronics and Applications (ICIEA). IEEE, 2020. http://dx.doi.org/10.1109/iciea48937.2020.9248115.

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"design of cyclic correlator for channel estimation in DTMB system Yuan Chen Yun Chen An Pan Jun Chen Xiaoyang Zeng State Key Lab of ASIC and System, Fudan University, Shanghai 201203, China." In 2007 7th International Conference on ASIC. IEEE, 2007. http://dx.doi.org/10.1109/icasic.2007.4415790.

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Kumar, Amit, Yuma Sandoval Ibarra, Jose Cruz Nunez Perez, and Esteban Tlelo Cuautle. "Chaotic Chen System for RGB Image Transmission by Parameter Switching." In 2018 International Conference on Mechatronics, Electronics and Automotive Engineering (ICMEAE). IEEE, 2018. http://dx.doi.org/10.1109/icmeae.2018.00009.

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Liu, Ruihan. "Stabilization of Chen Chaotic System via Variable-time Impulvise Control." In 2019 6th International Conference on Information, Cybernetics, and Computational Social Systems (ICCSS). IEEE, 2019. http://dx.doi.org/10.1109/iccss48103.2019.9115460.

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Lao, Seng-Kin, Hsien-Keng Chen, Lap-Mou Tam, and Long-Jye Sheu. "Microfluidic mixing using chaotic signals from the Chen-Lee system." In 2015 International Conference on Advanced Robotics and Intelligent Systems (ARIS). IEEE, 2015. http://dx.doi.org/10.1109/aris.2015.7158366.

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Reports on the topic "Chen system"

1

Robert, J., and Michael Forte. Field evaluation of GNSS/GPS based RTK, RTN, and RTX correction systems. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/41864.

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This Coastal and Hydraulic Engineering Technical Note (CHETN) details an evaluation of three Global Navigation Satellite System (GNSS)/Global Positioning System (GPS) real-time correction methods capable of providing centimeter-level positioning. Internet and satellite-delivered correction systems, Real Time Network (RTN) and Real Time eXtended (RTX), respectively, are compared to a traditional ground-based two-way radio transmission correction system, generally referred to as Local RTK, or simply RTK. Results from this study will provide prospective users background information on each of these positioning systems and comparisons of their respective accuracies during in field operations.

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Rahai, Hamid, and Jeremy Bonifacio. Reducing NOx Emissions of Cargo Handling Equipment (CHE) with Humid Air Systems. Mineta Transportation Institute, February 2020. http://dx.doi.org/10.31979/mti.2020.1859.

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Kress, Martin A., and Samuel J. Weintraub. AIS Data Case Study : Selecting Design Vessels for New Jersey Back Bays Storm Surge Barriers Study. Engineer Research and Development Center (U.S.), February 2021. http://dx.doi.org/10.21079/11681/39779.

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The purpose of this Coastal and Hydraulics Engineering technical note (CHETN) is to describe how historic Automatic Identification System (AIS) vessel position data were used to identify a design vessel for use in a storm surge barrier design study. Specifically, this CHETN describes how the AIS data were accessed, how the universe of vessel data was refined to allow for design vessel selection, and how that selection was used in a storm surge barrier (SSB) study. This CHETN draws upon the New Jersey Back Bays Coastal Storm Risk Management Feasibility Study (USACE-NAP 2019), specifically the Appendix B.2 Engineering Appendix Civil document1. The New Jersey Back Bays Study itself builds upon the work of the North Atlantic Coast Comprehensive Study (NACCS) initiated after Hurricane Sandy in 2012 (USACE 2015a).

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LeGrand, Sandra, Christopher Polashenski, Theodore Letcher, Glenn Creighton, Steven Peckham, and Jeffrey Cetola. The AFWA dust emission scheme for the GOCART aerosol model in WRF-Chem v3.8.1. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41560.

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Airborne particles of mineral dust play a key role in Earth’s climate system and affect human activities around the globe. The numerical weather modeling community has undertaken considerable efforts to accurately forecast these dust emissions. Here, for the first time in the literature, we thoroughly describe and document the Air Force Weather Agency (AFWA) dust emission scheme for the Georgia Institute of Technology–Goddard Global Ozone Chemistry Aerosol Radiation and Transport (GOCART) aerosol model within the Weather Research and Forecasting model with chemistry (WRF-Chem) and compare it to the other dust emission schemes available in WRF-Chem. The AFWA dust emission scheme addresses some shortcomings experienced by the earlier GOCART-WRF scheme. Improved model physics are designed to better handle emission of fine dust particles by representing saltation bombardment. WRF-Chem model performance with the AFWA scheme is evaluated against observations of dust emission in southwest Asia and compared to emissions predicted by the other schemes built into the WRF-Chem GOCART model. Results highlight the relative strengths of the available schemes, indicate the reasons for disagreement, and demonstrate the need for improved soil source data.

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Kress, Marin, David Young, Katherine Chambers, and Brandan Scully. AIS data case study : quantifying connectivity for six Great Lakes port areas from 2015 through 2018. Engineer Research and Development Center (U.S.), May 2021. http://dx.doi.org/10.21079/11681/40720.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) presents results from a preliminary examination of commercial vessel traffic connectivity between six major port areas on the Great Lakes using Automatic Identification System (AIS) data collected from 2015 to 2018. The six port areas included in this study are Calumet Harbor, IL and IN; Cleveland, OH; Detroit, MI; Duluth-Superior, MN and WI; Indiana Harbor, IN; and Two Harbors, MN. These six locations represent an important subset of the more than 100 federally authorized navigation projects in the Great Lakes maintained by the US Army Corps of Engineers (USACE). The results are presented in the context of USACE resilience-related policy initiatives as well as the larger topic of maritime system resilience.

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Torres, Marissa, Norberto Nadal-Caraballo, and Alexandros Taflanidis. Rapid tidal reconstruction for the Coastal Hazards System and StormSim part II : Puerto Rico and U.S. Virgin Islands. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41482.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) describes the continuing efforts towards incorporating rapid tidal time-series reconstruction and prediction capabilities into the Coastal Hazards System (CHS) and the Stochastic Storm Simulation System (StormSim). The CHS (Nadal-Caraballo et al. 2020) is a national effort for the quantification of coastal storm hazards, including a database and web tool (https://chs.erdc.dren.mil) for the deployment of results from the Probabilistic Coastal Hazard Analysis (PCHA) framework. These PCHA products are developed from regional studies such as the North Atlantic Coast Comprehensive Study (NACCS) (Nadal-Caraballo et al. 2015; Cialone et al. 2015) and the ongoing South Atlantic Coast Study (SACS). The PCHA framework considers hazards due to both tropical and extratropical cyclones, depending on the storm climatology of the region of interest. The CHS supports feasibility studies, probabilistic design of coastal structures, and flood risk management for coastal communities and critical infrastructure. StormSim (https://stormsim.erdc.dren.mil) is a suite of tools used for statistical analysis and probabilistic modeling of historical and synthetic storms and for stochastic design and other engineering applications. One of these tools, the Coastal Hazards Rapid Prediction System (CHRPS) (Torres et al. 2020), can perform rapid prediction of coastal storm hazards, including real-time hurricane-induced flooding. This CHETN discusses the quantification and validation of the Advanced Circulation (ADCIRC) tidal constituent database (Szpilka et al. 2016) and the tidal reconstruction program Unified Tidal analysis (UTide) (Codiga 2011) in the Puerto Rico and U.S. Virgin Islands (PR/USVI) coastal regions. The new methodology discussed herein will be further developed into the Rapid Tidal Reconstruction (RTR) tool within the StormSim and CHS frameworks.

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DiJoseph, Patricia, Brian Tetreault, and Marin Kress. AIS data case Study : identifying AIS coverage gaps on the Ohio River in CY2018. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40886.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) describes a method for evaluating the received coverage from Automatic Identification System (AIS) shore sites and the availability of historic vessel position reports along the Ohio River. The network of AIS shoreside sites installed and operated by the US Army Corps of Engineers (USACE) and the US Coast Guard (USCG) receive information transmitted from vessels; however, reception of these transmissions is generally line-of-sight between the vessel and the AIS site antenna. Reception may also be affected by factors such as the quality of the transceiver installation aboard the vessel as well as the state of the equipment at the receiving site. Understanding how to define and quantify coverage gaps along the inland river system can inform research utilizing AIS data, provide information on the performance of the AIS network, and provide guidance for efforts to address identified coverage gaps

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Collins, Clarence O., and Tyler J. Hesser. altWIZ : A System for Satellite Radar Altimeter Evaluation of Modeled Wave Heights. Engineer Research and Development Center (U.S.), February 2021. http://dx.doi.org/10.21079/11681/39699.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) describes the design and implementation of a wave model evaluation system, altWIZ, which uses wave height observations from operational satellite radar altimeters. The altWIZ system utilizes two recently released altimeter databases: Ribal and Young (2019) and European Space Agency Sea State Climate Change Initiative v.1.1 level 2 (Dodet et al. 2020). The system facilitates model evaluation against 1 Hz1 altimeter data or a product created by averaging altimeter data in space and time around model grid points. The system allows, for the first time, quantitative analysis of spatial model errors within the U.S. Army Corps of Engineers (USACE) Wave Information Study (WIS) 30+ year hindcast for coastal United States. The system is demonstrated on the WIS 2017 Atlantic hindcast, using a 1/2° basin scale grid and a 1/4° regional grid of the East Coast. Consistent spatial patterns of increased bias and root-mean-square-error are exposed. Seasonal strengthening and weakening of these spatial patterns are found, related to the seasonal variation of wave energy. Some model errors correspond to areas known for high currents, and thus wave-current interaction. In conjunction with the model comparison, additional functions for pairing altimeter measurements with buoy data and storm tracks have been built. Appendices give information on the code access (Appendix I), organization and files (Appendix II), example usage (Appendix III), and demonstrating options (Appendix IV).

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