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Sanneke van Asselen – Universiteit Utrecht

|www.uu.nl

juni 2016

Five millennia of sea-level, palaeostorm, and Maya land use

13 juni 2016 - 31 juli 2020
Tabasco Tabasco, Mexico + Google Maps

As in other modern deltas, the rich natural resources of the Usumacinta-Grijalva delta, Mexico have significantly contributed to the rapid advent of human civilisations, particularly of Olmec and Maya cultures. We explore the idea that human induced soil erosion in the hinterland resulted in a large supply of sediment to the rivers and contributed to the well development of the exceptionally large beach ridge plain of this delta. The understanding of delta evolution over the last thousands of years, for…

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Carbon sequestration in mangroves

13 juni 2016 - 31 juli 2020
Florida Verenigde Staten + Google Maps

Mangrove forests cover large parts of the tropical coasts where they sequester substantial amounts of carbon (Blue carbon). This high net sequestration rate is of special importance for oceanic mangrove systems, as the build-up of peat is essential to avoid inundation due to sea level rise. Mangroves are being exposed to increasing quantities of external nutrients and labile organic compounds from agricultural runoff and wastewater. This research studied how ongoing eutrophication of mangroves could modify the carbon sequestration potential. Results…

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Why is New Orleans sinking?

13 juni 2016 - 31 juli 2020
New Orleans New Orleans, Verenigde Staten + Google Maps

After Katrina (2005) much attention was paid to the origins of this disaster. Studies mostly focussed on levee failures, disaster management, meteorology, wetland development, etc. Land subsidence, the main reason why New Orleans can have flood waters of several meters depth, got much less attention. This project quantifies the amount of subsidence as a result of soil oxidation, which is a main contributor to total subsidence. Such information supports developing management strategies to slow down subsidence for a safer future…

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Responses of society to changes in the global water cycle

13 juni 2016 - 31 juli 2020

The research tries to find out how the individual right to water can best be combined with a sustainable use and management of water resources, thus trying to combine an individual short time right and a long term protection goal.

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Resilient infastructure in Mozambique: Governance and local impacts

13 juni 2016 - 31 juli 2020

The research analyses the social-political impacts of urban infrastructure development in Beira, Mozambique second largest city. The city of one of Africa's most vulnerable to climate change, with several innovative projects serving as a pilot for resilient infrastructure development in deltaic regions of the global South. The research analyses the various actors, interests and coalitions associated with these projects, as well as their local impacts on land governance.

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Polder management for sustainable livelihoods in Bangladesh

13 juni 2016 - 31 juli 2020

Sediments provide a high potential for a Building with Nature approach. This project builds on this notion and seeks to explore the potential of Living Polders in Bangladesh, that accrete along with rising water levels following sea level rise and subsidence. The project offers comprehension of integrated, coevolving physical and institutional processes across delta- and polder scales. Subsequently, it provides pathways to optimization through a Decision Support System for dynamic polder management and associated business cases. Project outcomes are evaluated…

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Rise and Fall

13 juni 2016 - 31 juli 2020

Many deltas worldwide are at risk of drowning, due to sea-level rise and land subsidence. Especially peat soils, that often occur in deltas, are prone to land subsidence due to compaction and oxidation of peat. In this research, geographers and biologists work together to investigate the present status and future potential for peat compaction and oxidation, in the organic-clastic subsurface of built-up areas.

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Strategies for subsiding Jakarta

13 juni 2016 - 31 juli 2020

Northern Jakarta is subsiding. In a few decades from now, it may have fallen an additional 3-5 metres below mean sea level. Unless action is taken, there will be more frequent and prolonged flooding. Until now, little has been achieved in terms of slowing subsidence in North Jakarta.This project aims at helping Jakarta by: (1) Inviting international researchers to discuss the exact causes of subsidence, (2) Setting-up a database with subsurface and geotechnical information, (3) Making improved subsidence predictions in…

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From river basin to barrier reef

13 juni 2016 - 31 juli 2020

Due to changes in land-use suspended sediment and nutrients, derived from the Berau Delta, might negatively impact coral reef health. This project focused on understanding and predicting the distribution of freshwater and suspended sediment over the Berau river and the estuarine channel network. Furthermore, it investigates the flow and suspended transport from the estuary mouths to the barrier reefs.

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Morphodynamic developments in distributary channel networks: impacts in the Pearl river Delta and the Rotterdam Rijnmond channel network

13 juni 2016 - 31 juli 2020

In 1970 the Haringvliet was closed off and tides no longer enter the Rhine-Meuse delta from this side. Furthermore, dredging activities and construction of new channels and canals have strongly altered the river flow and tidal propagation paths in the system. In this project we study how tides and river flow respond to the changes in channel geometry. Furthermore, we study how climate change and sea level rise can result in increased salwater intrusiuon lengths.

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Water quality management

13 juni 2016 - 31 juli 2020

The study tries to provide guidance to the transformation process in China's water management from a legal, political and policy.

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Global land subsidence map

13 juni 2016 - 7 juli 2020
Universiteit Utrecht, Heidelberglaan 2
Utrecht, 3584 CS

Land subsidence is a global problem, but a global land subsidence map is not available yet. Such map is crucial to raise global awareness of land subsidence, as land subsidence causes extensive damage (probably in the order of billions of dollars annually). With the global land subsidence map relative sea level rise predictions may be improved, contributing to global flood risk calculations.

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