Influence of oblique waves and berm on wave run-up: Wadden Sea and Lake IJssel case study
Başlık çevirisi mevcut değil.
- Tez No: 839114
- Danışmanlar: PROF. DR. JÜRGEN STAMM
- Tez Türü: Yüksek Lisans
- Konular: Denizcilik, Deniz Bilimleri, Marine, Marine Science
- Anahtar Kelimeler: Flood risk, wave run-up, wave overtopping, oblique wave influence, berm influence, hydra-NL, Wadden sea, Lake IJssel
- Yıl: 2022
- Dil: İngilizce
- Üniversite: Ihe Delft Instıtute For Water Educatıon
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Globally, vulnerability to coastal floods is increasing due to the increase in economic activities and population in flood-prone areas. In low-lying countries like the Netherlands, dikes play a crucial protective role against coastal floods. Dike structures are varying in applied roughness material, presence of berm, and slope. Besides waves are not always perpendicularly attacking. All these variations are important for determining dike crest heights to protect from floods. Many studies have been conducted for estimating the influences of oblique waves and berm on wave run-up and overtopping where most of them were conducted in a laboratory environment due to data shortage and high cost. This study aimed to analyze the influence of the oblique waves and berm on wave run-up process and compare the field observation with the estimation of empirical formulas considered by European Overtopping Manuel (EurOtop 2018) and other recently published new empirical formulas. Firstly, the Wadden Sea UHW location is chosen for very oblique wave attack. A hydrodynamic model for the Wadden Sea under extreme conditions is done to show the relevance of the study area and the significance of oblique wave attack. Later, wave run-up and overtopping discharge for two peaks of storm Ciara 2020 are analysed and observations are compared with estimations. Results showed that the UHW location is prone to very oblique wave attacks (β≥60°). For a single slope smooth dike without berm under very oblique wave attack (β=64°), EurOtop 2018 manual accurately estimates the wave run-up height, in comparison, the new empirical formula underestimates it. For mean wave overtopping discharge, only very limited data is available and the accuracy is far from accurate. Although EurOtop 2018 is overestimating, it is still the most reliable approach. Secondly, the Lake IJssel RDH location is chosen for its complex dike structure. It has a rough surface with varying slopes, a berm, and a riprap stack at the toe. Field observations are analysed and compared in four combinations of empirical formulas. Data with high run-up height observations is limited to β≤20°. Results showed that the new oblique wave formula under the presence of berm estimates slightly more accurate than EurOtop 2018 manual which is only in the highest recorded run-up heights. Results for berm influence show that the accuracy is not changed but the new formula has a tendency to give results more on the safe side. Lastly, for different return periods, water and wave conditions are obtained from the probabilistic model Hydra-NL and the required crest heights are determined.
Özet (Çeviri)
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