A Novel Comprehensive Evaluation Method for Estimating the Bank Profile Shape and Dimensions of Stable Channels Using the Maximum Entropy Principle

Bonakdari, Hossein; Gholami, Azadeh; Mosavi, Amir; Kazemian-Kale-Kale, Amin; Ebtehaj, Isa; Azimi, Amir H.

doi:10.3390/e22111218

Cited by 14 publications

(6 citation statements)

References 70 publications

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“…The specific evaluation steps are as follows (Zhao et al, 2018;Bonakdari et al, 2020): First, calculate the proportion of the measurement item i in the index j.…”

Section: Methodsmentioning

confidence: 99%

Research on the Impact of Social Propaganda and Guidance Policies on Public Green Travel Intention: Evidence From China

Yang

Sun²

2022

Front. Sustain.

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Social propaganda and guidance policies have important practical significance for promoting public green travel. In recent years, the rapid development of digital technology, network, and mobile communication technology has promoted a revolutionary change in the dissemination of information and services. However, in the era of new media communication driven by emerging technologies, there is still a lack of research on the impact of social propaganda and guidance policies on public willingness to travel green. Based on the theory of planned behavior and the survey research of China's urban residents, this study investigates the impact of social propaganda and guidance policies on public willingness to travel green. Regression analysis is used to identify the influencing factors of public green travel willingness, and to reveal the internal impact mechanism of social propaganda and guidance policies on public green travel willingness. The mediating role of public green travel attitude, subjective norm, and perceived behavior control in social propaganda and guidance policy and travel willingness are also empirically analyzed. The results show that social propaganda and guidance policies have a significant positive impact on green travel attitudes, subjective norms, perceived behavior control, and green travel intentions. Green travel attitude, subjective norm, and perceived behavior control play a mediating role in the relationship between social propaganda and guiding policies and green travel willingness, but the mediating effect of the subjective norm is relatively weak.

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“…The specific evaluation steps are as follows (Zhao et al, 2018;Bonakdari et al, 2020): First, calculate the proportion of the measurement item i in the index j.…”

Section: Methodsmentioning

confidence: 99%

Research on the Impact of Social Propaganda and Guidance Policies on Public Green Travel Intention: Evidence From China

Yang

Sun²

2022

Front. Sustain.

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“…For rivers, the entrainment threshold is one such mechanical constraint; yet, models that invoke extremal hypotheses do not formally apply this constraint. Researchers have posited that rivers adjust their channel geometry to maximize flow resistance 67,68 , maximize entropy 69 , or maximize sediment transport 148,149 . There is, however, no physical basis for predicting this 'optimal' river configuration; one can only assert that the observed state of a river is optimal.…”

Section: Alternatives To the 1 + ε Modelmentioning

confidence: 99%

“…Yet, others have observed that such discrepancies may arise from mischaracterization of the threshold condition and the near-threshold model itself 6,52,66 . Alternative models for hydraulic geometry have proliferated, based on: optimization of sediment transport [67][68][69][70][71] ; feedback between flow resistance and channel form 72,73 ; and geotechnical stability of river banks 74 .…”

Section: Introductionmentioning

confidence: 99%

The importance of threshold in alluvial river channel geometry and dynamics

Phillips¹,

Masteller²,

Slater³

et al. 2021

Preprint

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Many cities and settlements are organized around alluvial rivers, which are self-formed channels composed of gravel, sand and mud. Much of the time alluvial river channels are oversized, in that they could accommodate greater water flow; yet during extreme storms they are woefully undersized, and potentially catastrophic flooding can occur. Considering widely varying hydroclimates, sediment supply, geologic constraints and varying vegetation, it is not altogether obvious that rivers should achieve an average channel geometry that is pattern stable -let alone predictable from theory. Yet, natural rivers follow remarkably consistent hydraulic-geometry scaling relations, that are reproduced in laboratory experiments. Starting with the constraint that channel formation requires that fluid stress exceeds the threshold for sediment entrainment, we review the explanatory power of threshold channel models. Moreover we explore how deviations from threshold channel theory relate to higher-order dynamics of fluid and sediment transport -essentially perturbations to the threshold state -clarifying misconceptions regarding model applicability. Finally, we demonstrate the utility of the threshold channel framework for understanding channel patterns and responses to variations in external forcing such as hydroclimate and land use. Accurate field determination of the entrainment threshold itself is a notorious problem, and emerges as a central challenge in further development and application of threshold channel theory.

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“…Whenever no velocity data are available, expeditive entropy-based models might be used for the assessment of the vertical velocity profile in order to derive local velocity gradients and, thus, bed shear stress [24,25]. The hydraulic methods are suggested for use in catchment areas where hydrometric observations are not available, or for controlled cross-sections [26][27][28][29][30]. Furthermore, in the flow-habitat models, ecological flow is calculated from interactions between the water discharge and the riverbed morphology, rather than establishing the suitable habitat conditions corresponding to the local morphological conditions.…”

Section: Introductionmentioning

confidence: 99%

Definition of Ecological Flow Using IHA and IARI as an Operative Procedure for Water Management

2021

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It is widely recognized that the hydrological regime of natural flow plays a primary and crucial role in influencing the physical condition of habitats, which, in turn, determines the biotic composition and sustainability of aquatic ecosystems. The current hydro-ecological understanding states that all flow components might be considered as operational targets for water management, starting from base flows (including low flows) to high and flood regimes in terms of magnitude, frequency, duration, timing, and rate of change. Several codes have been developed and applied on different case studies in order to define common tools to be implemented for Eflow assessment. This work deals with the definition of an operative procedure for the evaluation of the Eflow monthly distribution to be adopted in a generic watercourse cross-section for sustainable surface water resource management and exploitation. The methodology proposes the application of the Indicators of Hydrologic Alteration methodology (IHA by TNC) coupled to the valuation of the Index of Hydrological Regime Alteration (IARI by ISPRA) as an operative tool to define the ecological flow in each monitoring cross-section to support sustainable water resource management and planning. The case study of the Agri River in Basilicata (Southern Italy) is presented. The analyses were carried out based on monthly discharge data derived by applying the HEC-Hydrological Modeling System at the basin scale using the daily rain data measurements obtained by the regional rainfall gauge stations and calibrated through the observed inlet water discharge registered at the Lago del Pertusillo reservoir station.

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A Novel Comprehensive Evaluation Method for Estimating the Bank Profile Shape and Dimensions of Stable Channels Using the Maximum Entropy Principle

Cited by 14 publications

References 70 publications

Research on the Impact of Social Propaganda and Guidance Policies on Public Green Travel Intention: Evidence From China

Research on the Impact of Social Propaganda and Guidance Policies on Public Green Travel Intention: Evidence From China

The importance of threshold in alluvial river channel geometry and dynamics

Definition of Ecological Flow Using IHA and IARI as an Operative Procedure for Water Management

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