Daan Poppema

• Doctor of Engineering
• Delft University of Technology

In sandy environments, like the beach-dune system, buildings not only affect the airflow, but also the aeolian sediment transport in their surroundings. In this study, we determine how the horizontal size of sediment deposition patterns around buildings depends on the building’s dimensions. Four one-day experiments were conducted at the beach using...

Worldwide, many houses, restaurants and other buildings are present at the beach. These buildings alter the airflow and windblown sediment transport in their surroundings. This causes patterns of deposition and erosion around buildings, which can block e.g. roads or beach entrances. Possible repercussions for the larger beach environment arise beca...

Buildings affect aeolian sediment transport and bedform development in sandy environments. Cellular automaton (CA) models have, however, only been used to simulate natural bedform dynamics. This study extends a well-known aeolian CA model to include sediment dynamics around buildings, and uses this model to explore the interaction of building-induc...

Recently, the use of salt marshes in front of hard structures is increasingly proposed as a more sustainable coastal protection measure. Yet, salt marsh restoration and creation is often hampered by the lack of a thorough understanding of initial vegetation establishment. Recent studies highlight the importance of bed level change for salt marsh de...

This paper presents a dataset documenting 71 floating debris accumulations at bridges following an extreme hydrological event that hit Belgium and Germany in July 2021. Data were collected from various sources including public authorities’ documents, public online databases, post event pictures and field visits. The dataset covers bridges geometry,...

This study investigates the effect of driftwood on submerged culverts through scale experiments, focusing on their accumulation and the hydrodynamic processes occurring underneath. Examining temporal evolution and velocity measurements, this research delves into the implications of driftwood accumulation, including its geometry, hydraulic condition...

During the European flood of 2021, large debris accumulations were observed at numerous bridges, causing backwater rise, increased upstream flooding, and extended damage. To date, debris accumulation studies mainly focused on debris consisting of logs, at bridge piers or debris racks. However, during the 2021 flood, debris contained a large share o...

Plain Language Summary Accumulations of wood in rivers (log jams) can block the flow and thereby cause water level rise. Follett et al. (2020a, https://doi.org/10.1029/2020gl089346) developed a theoretical model to predict how this water level rise depends on log jam properties and local river conditions. For the local river conditions, they used t...

Raw and processed data of field experiments on aeolian deposition and erosion patterns around beach buildings is hosted at 4TU.ResearchData. See: https://doi.org/10.4121/21285939.v2 Coastal Engineering paper based on data: "The effect of building geometry on the size of aeolian deposition patterns: Scale model experiments at the beach" Coastal Sed...

Supplementary material to 'Deposition patterns around buildings at the beach: Effects of building spacing and orientation'. The pdf shows additional orthophotos and elevation maps of some experiments described in the paper.

Supplementary material to 'Deposition patterns around buildings at the beach: Effects of building spacing and orientation'. The video shows a short timelapse of one of the experiments on the effect of building spacing (experiment B in the paper). It shows the build-up of the experiment and the formation of the deposition patterns over the course...

Airflow at the beach creates sand deposition patterns around buildings. To assess how initial deposition patterns depend on the orientation of a building relative to the wind direction and on the spacing between buildings, a series of one-day field experiments was conducted with cuboid scale models, in which 34 configurations were tested. Scale mod...

Raw and processed data related to the Geomorphology article "Deposition patterns around buildings at the beach: Effects of building spacing and orientation" is hosted at 4TU.ResearchData. See: https://doi.org/10.4121/16860145.v3

The long-term physical existence of sandy shores critically depends on a balanced sediment budget. From the principles of Building with Nature it follows that a sustainable protection of sandy shores should employ some form of shore nourishment. In the spatial design process of urbanized sandy shores, where multiple functions must be integrated, th...

Sandy shores worldwide suffer from coastal erosion due to a lack of sediment input and sea-level rise. In response, coastal sand nourishments are executed using ‘Building with Nature’ techniques (BwN), in which the sand balance is amplified and natural dynamics are instrumental in the redistribution of sand, cross- and alongshore. These nourishment...

Buildings at the beach-dune interface, such as restaurants and (holiday) houses, affect wind-driven sand transport in their surroundings. Hereby they shape the development of the beach-dune system. This can have implications for the flood protection offered by dunes. Therefore, this research aims to understand the effect of buildings at the beach-d...

This report describes existing literature on the effect that building that are built on the beach or in the dunes have on the morphological development of the beach-dune system. After an introduction, chapter 2 examines aeolian sand transport and morphology of a natural beach-dune system. Chapter 3 examines the effects of buildings: wind flow arou...

Worldwide, buildings are present at the beach and in the dunes for recreation or habitation. Their presence can affect the beach-dune development, because they affect the airflow and Aeolian sediment transport in their surroundings. This might eventually have repercussions for coastal safety. We start examining these effects by studying the local s...

Coastal dunes are important aeolian landforms, since they act as a buffer zone absorbing wave attack and they protect the inland areas from flooding by storm surges. Humans modify the natural ecosystem of beaches and dunes in many ways. Rapid urbanization of coastal zones has been widespread around the world during the last century, since they typi...

Dunes provide protection against flooding and a high ground to live on. At the same time, the beach and dunes form an attractive area for recreation. This leads to the presence of buildings like restaurants and (holiday) homes at the land-sea interface. These buildings affect wind-driven sand transport and thereby shape the development of the dunes...