The effect of vents' number in bridges for the same contraction ratio was not taken into consideration in many calculation formulas of afflux. The present paper investigates the influence of vents' number on the calculation of the afflux through bridge for the same contraction ratio. The paper experimentally and numerically modeled the water surface profile through the bridge vents to calculate the afflux. The experimental measurements include two stages, the first stage includes the use of a single pier model with a length of 14.7 cm and a width of 2.3 cm. The second stage includes the presence of two piers of 14.7 cm length and 1.15 cm width for each one. The numerical modeling was done using one-dimensional River Analysis System (HEC-RAS). The results showed that the afflux ratio increased as Froude number increased. The increasing of vents' number for the same contraction ratio increases the afflux. The case of contraction ratio = 0.623 gives the higher values of the afflux ratio comparing other contraction ratios. The numerical modeling is promising compared the experimental measurements.

The current research aims to study the concept of sharing economy in the context of peer-to-peer accommodation in Egypt through Airbnb platform and to determine the factors which motivate customers to choose this intended service. The research applied a descriptive quantitative approach. A multiple-frame non-random sampling approach was deemed necessary. Data were collected via an online survey using anonymous link and 353 valid responses from Airbnb` s adult users.Results indicated the influence of six factors that motivate customers to choose peer-topeer accommodation; economic benefits, home benefits, social benefits, local authenticity, novelty, and sharing economy ethos. Moreover, customers` attitude was significantly related to behavioral intentions and perceived value proved to be a mediator between motivating factors and customers` attitude towards peer-to-peer accommodation. Customers` attitude also came out to be a mediator between the motivating factors and behavioral intentions. Derived from the theory of planned behavior (TPB) which is based on the theory of reasoned action (TRA), the current research determined only six motivating factors for participating in peer-to-peer accommodation. Future researches may investigate other factors. The research provides implications for peer-to-peer accommodation providers and for hotel marketers.

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