Spatiotemporal Variation in Total Sediment Load Concentration and Related Factors of Shoreline Waters Based on Disorder
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RESEARCH PAPER
Spatiotemporal Variation in Total Sediment Load Concentration and Related Factors of Shoreline Waters Based on Disorder Power Index Saeed Khorram1 · Forough Ghasemi2 Received: 22 March 2017 / Accepted: 13 July 2018 © Shiraz University 2020
Abstract Entropy is a property of a system which measures the uncertainty or disorder within the system. In hydraulics, uncertainties occur in flow variables, such as velocity, sediment concentration, wave. Using entropy, it is possible to establish connections between deterministic and probabilistic domains. To describe sediment transport distributional/autocorrelation properties, including scaling behavior both in state and in time, the well-founded physical and mathematical entropy theory is generally used wherein the spatiotemporal disorder power index (STDPI) is considered to have the maximum uncertainty. Effort has been made in this research to propose a novel entropy method capable of accurately calculating the total sediment load concentration (TSLC) in the shoreline region. Accordingly, STDPI and entropy method have been suggested for finding the TSLC to analyze the spatiotemporal patterns/reports based on a shoreline zone case study because STDPI is quite suitable for marine and hydrological ecosystem components analyses. The method makes use of the monthly data of six shoreline sections in Makran Ocean region in the time period between 1970 and 2015 and investigates the spatiotemporal patterns of the wave height and TLSC variables both of which depend on time and play important parts in terrestrial hydrological studies. These variables usually show meaningful spatiotemporal variability, but explanation of their combined performance is not an easy task. As the results show, STDPI can simulate TSLC and wave when concentration, flow conditions, and granulometry vary. Keywords Spatiotemporal · Entropy theory · Shoreline zone · Total sediment load · Maximum uncertainty
1 Introduction It is predictable that the rise in the sea level and wave climate change can cause extensive beach sedimentation under the current global climate variations. Unprecedented adaptation methods would be required for the management of this coastal response to climate variations together with the coastal changes created over many decades.Since sediment transport is incessantly subject to changes, it is variable because it can vary due to such external factors as the * Saeed Khorram [email protected] Forough Ghasemi [email protected] 1
Department of Civil Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
Department of Urban Planning, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
2
water flow, water level, weather events, and human influence besides variations in the sediment load due to organic elements, geomorphology, and geology. A shoreline is a transition zone between inland waters and the open ocean, and the related TSLC is influenced by the conditions prevailing at the end of this zone and variations caused by the river discharge,
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