H2020Индивидуална стипендия2016–2018

WaterfallModel3D · Controls on knickpoint migration and consequences for landscape evolution: experimental and numerical modelling

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2016-06-01 → 2018-05-31
Финансиране от ЕС: 173 076 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Динамиката на „точките на пречупване“ в речните легла, като водопадите, се анализира чрез експерименти и модели. Това помага да се разбере как промените в климата и тектониката оформят релефа и влияят върху риска от свлагвания.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Controls on knickpoint migration and consequences for landscape evolution: experimental and numerical modelling

Bedrock river channels mediate the response of the landscape to changing boundary conditions, such as tectonics and climate through migrating ‘knickzones’ or ‘knickpoints’, often in the form of waterfalls. As they migrate upstream, adjoining hillslopes tend to become longer and steeper due to the sudden drop in the channel elevation downstream of the knickpoint, potentially increasing the rate of sediment transport and the susceptibility to landsliding on hillslopes. Such a concept of an ‘upstream incision wave’ also occurs in geomorphological systems beyond mountain rivers such as soil erosion on hillslopes, rill/gully formation and the erosion of sediment following dam removal. Thus, understanding the response of bedrock river channels, and knickpoints in particular, to external perturbations is vitally important for the understanding of landscape evolution across multiple spatial and temporal scales. However, the complexities of these processes are often ignored in studies of landscape evolution, in favour of simple relationships between erosion rate and parameters such as catchment drainage area. This project aimed to explore and quantify the complexities of knickpoint erosion processes and the dynamics of knickpoint retreat to improve the understanding of how landscapes evolve in response to an ‘upstream incision wave’ induced by changes in tectonic and climatic forcing.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

As the link between the fluvial network and hillslopes, bedrock channels mediate the response of the landscape to changing boundary conditions, such as tectonics and climate through migrating ‘knickzones’ or ‘knickpoints’, yet the complexities of the mechanisms of knickpoint retreat are often ignored in studies of landscape evolution. This fellowship aims to understand the controls on knickpoint retreat rate and explore the implications for landscape evolution (e.g. channel-hillslope coupling) and other processes that respond through an ‘upstream incision wave’ such as gully erosion, using a range of complementary experimental and numerical modelling approaches. The experimental modelling will isolate the impact of different controls (discharge, knickpoint erosion mechanism, bedrock strength, sediment flux) on knickpoint retreat which will be used to develop an understanding of the key factors that can be used to predict knickpoint retreat through landscapes. This understanding will then be implemented in the numerical landscape evolution code €ros, through the adaptation of the parameters that control knickpoint retreat (currently based on the stream-power incision model assumption that knickpoint retreat scales with drainage area). The model will be run on several mountain landscapes ranging from areas where previous work has identified a strong correlation between knickpoint retreat rate and discharge/drainage area (e.g. New Zealand) to study areas where other factors are thought to be more dominant in controlling the retreat rate (e.g. Iceland). This will improve the understanding of how these landscapes have responded to changes in past changes tectonic/climate forcing, and can also be used to predict how the landscapes will respond to future transient forcing over short and long timescales.

Оригинален текст от CORDIS (на английски).

Участници

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS · ParisКоординаторФранция