Assessment of The Impact of The Ratio of The Developed Area on The Fluvial Flood Risk of Lower Wortley Beck

Year 2019, Volume: 1 Issue: 1, 29 - 39, 15.06.2019

Pelin Sertyeşilışık

Abstract

Population and valuable
investments have been increasing day by day in basins. Thus, urban rives create
a serious potential risk in the cities. This paper investigates the impacts of the
percentages of the impermeable surfaces on the discharges from sub-catchments of
the Lower Wortley Beck, Leeds, UK. Lower Wortley is in urbanized
and ungauged part of the basin. The fluvial flood events were created by
combining hydrological and hydrodynamic models for various events. Flood events
were designed by using Revitalised Flood Hydrograph (ReFH) rainfall-runoff
models. The impact of land use changes was examined by applying various Extent
of urban and suburban cover (URBEXT) parameter of the Flood Estimation Handbook
(FEH) catchment descriptor. Also, flood extents were simulated by linking Flood
Modeler Suite with TUFLOW, hydrodynamic models. The outcomes of these simulations are probabilistic
inundation maps with maximum water depth values. Thus, the impact of the
different percentages of the impermeable surfaces of the sub-catchments on the
discharge and fluvial flood risk at the downstream can be observed. These outcomes can be used to enrich the flood resilience approaches by
city councils.

Keywords

Probabilistic Fluvial Flood Risk Assessment, Urban Rivers, Land Use Change, URBEXT

Thanks

The UK Evironment Agency, the ordnance surey and Leeds City Council supplied the data sets of this research. This paper is a part of Pelin Sertyesilisik`s PhD research in University of Leeds 2017.

Gelişmiş Alan Oranının Aşağı Wortley Nehrinin Sel Riskine Olan Etkisinin Değerlendirilmesi

Abstract

Havzalardaki nüfus ve değerli yatırımlar gün be gün
artmaktadır buyüzden şehirlerdeki
nehirler ciddi bir risk oluşturmaktadır. 
Bu makale İngiltere, Leeds de bulunan aşağı Wortley nehrini besleyen, alt
havzalardaki geçirimsiz yüzey oranlarının, çıkış debilerine olan etkisini
araştırmaktadır.  Aşağı Wortley, havzanın
kentleşmiş ve debi kayıt merkezi bulunmayan kısmındadır. Nehir taşkın senaryoları
hidrolojik ve hidrolik modellerin birleştirilmesiyle oluşturulmuştur. Sel
olayları Revitalised Flood Hydrograph (ReFH) yağış-akış modeli kullanılarak
dizayn edilmiştir. Arazi kullanım değişikliklerinin etkileri farklı
değerlerdeki, sel tahmin el kitabındaki (FEH) havza tanımlayıcılarından biri
olan, kentsel ve banliyö örtüsünün kapsamı (URBEXT) parametresinin farklı
değerleri uygulanarak çalışılmıştır. Ayrıca, sel genişlikleri, Flood Modeler
Suite ile TUFLOW hidrodinamik modelleri aracılığı ile elde edilmiştir. Bu
simülasyon çıktıları maksimum su derinliği değerlerine sahip olasılıksal sel
alanları haritalarıdır. Böylece, alt havzalardaki farklı yüzdelerdeki
geçirimsiz yüzeylerin, çıkış debilerine ve aşağı havzadaki sel felaketine olan
etkileri gözlemlenebilir.  Bu sonuçlar,
şehir konseylerinin taşkın dayanıklılığı yaklaşımlarını geliştirmesinde kullanılabilir.

Keywords

Olasılıksal Nehir Taşkın Riski Değerlendirmesi, Şehir Nehirleri, Arazi Kullanımı Değişikliği, URBEXT

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