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Vegetation influences flow dynamics and sediment transport significantly and numerical modeling can be a powerful tool to investigate these interactions. But the effect of the hydraulic resistance of vegetation using friction approaches on sediment dynamics has not yet been considered in numerical models. Therefore, we aim to provide a comprehensive modeling approach by incorporating vegetation friction approaches in hydromorphodynamic modeling using the software openTELEMAC.

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Heavy rainfalls increase with climate change and present the problem of triggering flash floods and pluvial floods anywhere, anytime. We must use accurate hydrodynamic models to describe heavy rainfall induced floods to assess the resulting damage potential. However (but), an urbanized surrounding introduces many new uncertainties and obstacles in comparison to conventional fluvial flood modeling. Therefore, my thesis develops and quantifies innovative methods to tackle these uncertainties and obstacles, such as defining boundary conditions, modeling culverts on a catchment scale, and efficiently represent buildings in hydrodynamic modeling.

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Freshwater systems face unprecedented pressures as stream temperatures increase and anthropogenic activities continue worldwide. But conventional environmental conservation approaches are not effective enough to tackle the continued environmental degradation in rivers. Therefore, innovative strategies for climate adaptation are required to promote river resilience and the future conservation of our freshwater ecosystems

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My PhD should show a way to increase efficiency in turbines and reduce cavitation but the rotors are already very good therefore we are also investigating the suction tube using numerical methods and physical tests

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My PhD should show a way to increase efficiency in turbines and reduce cavitation but the rotors are already very good therefore we are also investigating the suction tube using numerical methods and physical tests

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using drone data to understand the effects on different filtering methods in SfM when generating the pointcloud underwater/ determine bathymetry. Therefore, physically data are compared with processed data.

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I´m focusing on the technical-economic optimization of the shaft hydropower concept.

The shaft power plant has been developed as a novel hydraulic concept for low-head hydropower sites and is offering several environmental and operational advantages compared to conventional layouts. But the first two projects implementing this concept have shown that construction costs and associated project risks as well as operational efforts are comparatively high. Therefore, further optimization targeting the reduction of construction cost, risk and time is required to increase economic attractiveness and to enable a broader market uptake of this concept.

1. Identification of Optimization Potential

Focus on the technical-economic aspects of the Shaft Power Plant concept (construction & operation).

2. Testing and Validation

Utilize a 3D hydraulic numerical application.

Analyze various geometries for shaft power plant intakes that seem more favorable in economic terms (lower constructional and operational efforts)

3. Application of Validated 3D-HN Methodology

Implement the validated 3D hydraulic application.

Conduct analysis on at least one specific case study: At-Bashy Hydropower Plant (HPP).

4. Evaluation of Optimized Setup

Assess the outcomes and performance of the optimized setup based on the findings from the At-Bashy HPP case study.

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Allowing bank erosion is a possibility to decrease bed erosion and enhance ecological value of the river.

But often only non-cohesive materials are considered in 2D models which neglect the mechanisms of stratified riverbanks, like slump block failures or seepage and their impact on the bank.

Therefore, finding a way to represent these mechanisms in a 2D model would help to predict the impact of implementing this strategy.

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Water temperature is recognized to regulate several physico-chemical and biological processes in aquatic ecosystems and its changes projected by climate change are expected to severely affect habitat quantity and quality. But as of today it is not sufficiently considered in river engineering and management strategies. Therefore it is important to integrate water temperature in monitoring and river engineering tools such as numerical modelling.

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What is it about:

*Evaluate dynamic and spatial patterns of stream temperature with respect to hydro morphological river characteristics

*Modelling not only stream temperature dynamics but also thermal heterogeneity of river streams identified through thermal infrared imagery (TIR) within a 2D modelling approach.

*Integrating drivers of thermal heterogeneity such as groundwater sources that influence habitat availability and quality on a reach scale.

*Evaluate the importance of stream temperature considerations in habitat modelling - how does habitat quantity and quality change when additionally integrating it?

*How can we integrate stream temperature within habitat modelling frameworks such as Casimir and MesoHABSIM?

*How does integrating stream temperature affect planning environmental flow concepts considering projections of climate change?

*How effective can coldwater tributary reconnections be in improving thermal habitat conditions of river streams?

This is just a brainstorm.

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Piano Key Weirs (PKWs), known for their efficient hydraulic performance in river applications and dam rehabilitation projects, often encounter challenges related to scour development and the effects of submerged conditions in mildly sloped rivers. These issues can lead to discharge capacity reductions, compromising both structural stability and the downstream environment. While some literature exists on the submergence effect and scouring processes, but there is a lack of research addressing the impact of energy dissipation structures on scour development. Furthermore, no numerical studies are available to investigate the submergence effect of PKWs on discharge capacity. Therefore, my research aims to study the scouring mechanisms downstream of PKWs under various hydraulic conditions and to numerically analyze the effects of submergence on their discharge capacity.

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Hannah

Sediment transport processes in rivers are highly relevant for water management problems and infrastructure planning and changes due to water uses such as water abstraction and diversion and artificial channelization and damming of rivers artificial alters these processes.

But quantification of sediment transport processes is difficult due to missing data especially in remote region, where the rivers are still in near natural conditions.

Therefore, detailed research is needed in the field of hydromorphological processes using different assessment and modeling tools at different scales focusing on rivers in near natural conditions.

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use of sedFoam for sediment transport around hydraulic structures

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use of sedFoam for sediment transport around hydraulic structures

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CFD is a powerful tool to simulate sediment transport and scour around hydraulic structures and these numerical models are based on modelling empirical formulation of sediment load and bed shear stress. But most of these empirical formulations were derived from laboratory scale experiments that dont necessarily translate to real world scale. Recently, a CFD code sedFoam was developed that models the transport of sediment as a fluid phase instead of empirical sediment load formulations. Therefore, the necessity arises to test whether sedFoam can model sediment transport around hydraulic structures accurately and figure out how it performs in contrast to the classical sediment transport models.

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Hydraulic structures, especially water intake structures are often embossed by unwanted sediment deposits which can greatly impact their operation efficiency and longevity.

My research introduces an effect created by flow under partially submerged angled vertical baffle walls on bedload transport which can be used to guide the bedload movement in channels and sluices and to protect hydraulic structures from unwanted bedload deposits.