Wyniki wyszukiwania - BazTech

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Application of Two-Dimensional Hydraulic Modelling of Hydrological Risk Related to Urban Flood. A Case of the Taza City, Morocco

Bouiss Hanae, Bengamra Said, Amarjouf Najat, Oujidi Mostafa, Amar Iman, Grari Abdellatif

Ecological Engineering & Environmental Technology

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2023

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Vol. 24, iss. 6

173--185

EN

Flood Risk modelling and analysis have received plenty attention globally because of the growing rate of flood failures in maximum riverine regions. This work aims to map the flood hazard in an urban environment through twodimensional (2D) modelling with the Iber software. The study area is the city of Taza, located between the Pre Rif and the Middle Atlas in the northeast of Morocco. The inputs to the 2D model are metrological, hydrological, topographical and geological data. The hazard map is developed using 2D hydraulic modelling. The results obtained show that the propagation of rainwater occurs rapidly due to the rugged terrain of the region studied and the impermeability of the soil.

2

Method for assessing the impact of rainfall depth on the stormwater volume in a sanitary sewage network

Kozłowski Edward, Kowalski Dariusz, Kowalska Beata, Mazurkiewicz Dariusz

Archives of Civil and Mechanical Engineering

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2022

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Vol. 22, no. 1

art. no. e8, 2022

EN

Sanitary sewage network is relatively rarely considered as the cause of urban floods. Its hydraulic overload can result not only in flooding, but also sanitary contamination of subcatchments. Stormwater is the main reason for this overload. In contrast to the stormwater or combined sewer system, these waters infiltrate into the network in an uncontrolled way, through ventilation holes of covers or structural faults and lack of tightness of manholes. Part of stormwater infiltrates into the soil, where it leaks into pipelines. This greatly hinders assessing the quantity of stormwater influent into the sanitary sewer system. Standard methods of finding correlation between rainfall and the intensity of stormwater flow are ineffective. This is confirmed, i.a. by the studies performed in an existing network, presented in this paper. Only when residuals analysis was performed using the ARIMA and ARIMAX methods, the authors were able to develop a mathematical model enabling to assess the influence of rainfall depth on the stormwater effluent from the sewage network. Owing to the possibility of using the rainfall depth forecasts, the developed mathematical model enables to prepare the local water and sewerage companies for the occurrence of urban floods as well as hydraulic overload of wastewater treatment plants.

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Trends in daily changes of precipitation on the example of Wroclaw

Kaźmierczak Bartosz, Wdowikowski Marcin, Gwoździej-Mazur Joanna

Ekonomia i Środowisko

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2019

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nr 1

142--151

EN

The study analyzed 8295 daily rainfalls recorded in Wrocław from 1960 to 2017. The frequency of daily precipitation in a year was determined in nine categories: from very weak (less than 1.0 mm) to disastrous (over 100 mm). In addition, the precipitation trends were determined by linear regression and the Mann-Kendall test. Analysis of the variability of the number of days with precipitation of particular categories showed a statistically significant downward trend for moderately strong precipitation (10.1-20.0 mm). In case of other categories of precipitation, the tests did not show statistically significant changes.

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Local flooding in the USA, Europe, and Poland - an overview of strategies and actions in face of climate change and urbanisation

Jarosińska E.

Infrastruktura i Ekologia Terenów Wiejskich

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2016

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nr III/1

801--821

EN

Urbanisation and climate change have significant impact on disturbing water balance in catchments. Uncontrolled urban development, increased land surface sealing, and increasingly appearing heavy rainfall cause local inundations called urban flooding. Rational catchment water management necessitate that a new approach to the problem of flooding be introduced that includes the human factor. Greater emphasis should be placed on local management of rainfall water within catchment, especially in urban areas. What is more, it is of utmost importance to provide efficient legal system and co-operation of various authorities and decision-makers in terms of urban land use management. The present article reviews different courses of actions taken in order to improve reasonable water management in the USA, Europe, and Poland in face of climate change and urbanization that cause flooding.

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Zagrożenia dla infrastruktury miast wynikające ze zmian klimatu

Kotowski A.

Gaz, Woda i Technika Sanitarna

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2015

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Nr 11

417--423

PL

W pracy omówiono zagrożenia dla infrastruktury miast wynikające z niedoboru bądź nadmiaru wody w przyszłości, wywołane zmianami klimatu. Mianowicie, zaprezentowano wyniki badań trendów zmian w strukturze opadów w Europie, w tym w Polsce, odnośnie wysokości i częstości występowania intensywnych opadów deszczy na przykładzie danych z dorzecza Górnej Odry i Wrocławia. Wykazano potrzebę zmiany scenariuszy opadów do modelowania nadpiętrzeń w kanałach oraz zaproponowano kryteria do oceny przeciążeń kanalizacji w przyszłości, dla zachowania w dopuszczalnych obecnie (wg PN-EN752:2008) częstości wylewów z kanałów. Uzasadniono tym samym konieczność podjęcia już dzisiaj odpowiednich działań zaradczych, polegających m.in. na identyfikacji rejonów potencjalnych przeciążeń systemów odwodnień terenów w przyszłości i miejscowym zagospodarowaniu wód opadowych – zgodnie z zasadą zrównoważonego rozwoju.

EN

The paper discusses the threats to urban infrastructure resulting from the deficiency or excess of water in the future, due to climate change. It presents trends in precipitation changes in Europe, including in Poland, regarding the amount and frequency of heavy rainfall based on data from the Upper Odra Catchment and Wrocław. It has been shown the need to change rainfall scenarios for modeling the sewage system and proposes criteria to determine whether overloads the sewage system in the future, to preserve the currently acceptable frequency of floods (PN-EN752:2008). It was justified by the need to take appropriate remedial action, involving, among others, identifying areas prone to flooding in the future and rainwater harvesting – in accordance with the principle of sustainable development.