Papers by Andrea Bolognesi
Water Science and Technology, 2010
The Navile Channel (Bologna, Italy) is an ancient artificial water course derived from the Reno r... more The Navile Channel (Bologna, Italy) is an ancient artificial water course derived from the Reno river. It is the main receiving water body for the urban catchment of Bologna sewer systems and also for the Waste Water Treatment Plant (WWTP) main outlet. The aim of this work is to evaluate the Combined Sewer Overflows (CSOs) impact on Navile Channel's water quality. In order to collect Navile flow and water quality data in both dry and wet weather conditions, two measuring and sampling stations were installed, right upstream and downstream the WWTP outflow. The study shows that even in case of low intensity rain events, CSOs have a significant effect on both water quantity and quality, spilling a considerable amount of pollutants into the Navile Channel and presenting also acute toxicity effects. The collected data shown a good correlations between the concentrations of TSS and of chemical compounds analyzed, suggesting that the most part of such substances is attached to suspende...
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Water Science and Technology, 2012
Roadside gully pots are the connecting points between surface runoff and the underground drainage... more Roadside gully pots are the connecting points between surface runoff and the underground drainage network; therefore they can be considered as the most superficial component of urban drainage systems. Gully pots are supposed to trap particulate matter washed off the catchment surface, but also to collect and convey stormwater into the network. The continuous accumulation of particulate matter results in a progressive loss of the gully pot hydraulic conveyance, thereby increasing the probability of urban flooding during rainstorm events. This study has therefore the objective to determine which variables influence the gully pot capability of retaining solids (efficiency), both experimentally and analytically. Several laboratory tests have been performed on a simple plastic gully pot, with different inflow rates and using both mono and hetero-disperse particle samples. Particular attention has been given to the influence exerted by the way particle settling velocity is expressed: effi...
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Procedia Engineering, 2014
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Water, 2012
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Water Supply, 2013
The collection and distribution of drinking water resources generally require large quantities of... more The collection and distribution of drinking water resources generally require large quantities of energy, that vary according to factors related to the characteristics of the served area, as well as to design and management choices. Energy intensity indicators (energy per unit of volume) are insufficient to assess the weight of different factors that affect the energy consumption and appear not suitable for the comparison of different water supply systems. The key step of this work is to define a methodology for assessing the energy efficiency of water supply systems. In particular, water losses in water distribution systems, generally assessed in relation to the quantity of high quality water dispersed in the environment, are herein considered in relation to their energy content. In addition to the evaluation of energy balance using the approach proposed by Enrique Cabrera et al. in ‘Energy audit of water networks’ (see J. Water Res. Plan. Manage.136 (6), 669–677) an overall effici...
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Journal of Environmental Engineering, 2012
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Journal of Computing in Civil Engineering, 2014
ABSTRACT The design of a WDN is conceptually a multi-objective problem characterized by stringent... more ABSTRACT The design of a WDN is conceptually a multi-objective problem characterized by stringent constraints. Even in its most simple formulation, which requires only the maintenance of minimum pressures, is difficult to handle, and the simplifications introduced often impair the practicality of the solutions found. The paper aims at integrating an engineering approach to the optimization problem by generating pseudo-fronts in the hydraulically feasible region of the search space. The optimization algorithms provides a strictly feasible trade-off between cost and considered constraints, which may be directly used by a hypothetical decision maker. This engineering approach requires a fast tool in the search of feasible solutions: the recently developed algorithm GHEST (Genetic Heritage by Stochastic Evolution Transmission) used herein, has proven to be effective and efficient in solving the optimal design problem of WDNs. Tests are carried out on two real size water distribution networks (Balerma and Modena), using the GHEST algorithm, here modified in order to account for several objectives. Read More: http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29CP.1943-5487.0000280
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Advances in Engineering Software, 2010
This paper proposes a new model named GHEST, a multi-population evolutionary-strategy-like algori... more This paper proposes a new model named GHEST, a multi-population evolutionary-strategy-like algorithm applied to the optimal design of water distribution networks (WDN). GHEST hunts for the optimal solution by means of two different complementary processes. The first one, synthesizes and transmits the genetic patrimony (heritage) of the parent solutions using their statistical indicators. The second one, called “shuffle”, avoids the
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Hydrology and Earth System Sciences, 2011
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Papers by Andrea Bolognesi