Coupling sediment supply from hillslope hydrology and fluvial morphodynamics at tropical mountain basins
Cargando...
Autores
Cataño Álvarez, Santiago
Director
Tipo de contenido
Document language:
Inglés
Fecha
Título de la revista
ISSN de la revista
Título del volumen
Documentos PDF
Resumen
Abstract
Mountain basins are open dynamic systems which organize at multiple scales to transform
hillslope sediment supply to fluvial sediment transport. In a given river reach, its
form and sediment regime depend on basin processes and are contingent to geomorphic
history. Lack of such information makes modelling the way to estimate this spatiotemporal
context. However, there is a gap of combining spatiotemporal variability of hydrology
and landslides sediment supply with its effect: the feedback between channel form and
sediment transport. Hillslope and fluvial modules of a new model called Fluvial Hydro-
Geomorphology Model (FHGM) are produced which, in hollows and river reaches that
are deformable, encapsulates complexity via parameterization or random forcing. FHGM
solves responses to every major rain event, and accumulate them in decadal timescale, to
include occurrence of channel forming floods as well as landslides with varied sizes and
source zones. FHGM landslides module reproduces power law spatial distribution of
landslide volumes, as well as magnitud and frecuency of sediment supply. FHGM fluvial
module, calibrated with a new gravel flume experiment, reproduces a broad range of
morphologic conditions, from incised to clogged, and produces mean bankfull capacity
consistent to mean maximum annual flood and with empirical dimensionless hydraulic
geometry patterns for channel depth and width. This work shows how mountain basins
organize to minimize the duration of formative events, by editing channels capacity and
deforming sediment storages to recover stability and structure; a resilience akin to living
beings.
Palabras clave propuestas
Descripción
Ilustraciones, mapas