15 research outputs found
Evaluation of morphometric parameters derived from Cartosat-1 DEM using remote sensing and GIS techniques for Budigere Amanikere watershed, Dakshina Pinakini Basin, Karnataka, India
The implication of climate change and precipitation variability on sedimentation deposits in Algerian dams
Rainfall-runoff modeling of ungauged Wadis in arid environments (case study Wadi RabighâSaudi Arabia)
Hypsometric Analysis Using Microwave Satellite Data and GIS of NainaâGorma River Basin (Rewa district, Madhya Pradesh, India)
Morphology and channel characteristics of an equatorial tropical river in Malaysian Borneo: a detailed evaluation through spatially explicit geomorphometric modelling
Geoinformatics application for assessing the morphometric characteristicsâ effect on hydrological response at watershed (case study of Wadi Qanunah, Saudi Arabia)
Spatial variation of the hypsometric integral and the implications for local base levels in the Yanhe River, China
Morpho-hypsometric evolution of the Karuvannur River Basin, a tropical river in central Kerala, southwestern peninsular India
Landscape response to progressive tectonic and climatic forcing in NW Borneo: Implications for geological and geomorphic controls on flood hazard
(IF 4.12; Q1)International audienceEmpirical models have simulated the consequences of uplift and orographic-precipitation on the evolution of orogens whereas the effects of these forcings on ridgelines and consequent topography of natural landscapes remain equivocal. Here we demonstrate the feedback of a terrestrial landscape in NW Borneo subject to uplift and precipitation gradient owing to orographic effect, and leading to less-predictable flooding and irreversible damages to life and property. Disequilibrium in a large catchment recording the lowest rainfall rates in Borneo, and adjacent drainage basins as determined through Ï, a proxy for steadyâstate channel elevation, is shown to result in dynamic migration of water divide from the windward-side of the orogen towards the leeward-side to attain equilibrium. Loss of drainage area in the leeward-side reduces erosion rates with progressive shortening resulting in an unstable landscape with tectonic uplift, gravity faults and debris flows. 14 C dating of exhumed cut-and-fill terraces reveal a MidâPleistocene age, suggesting tectonic events in the trend of exhumation rates (>7 mm a â1) estimated by thermochronology, and confirmed by morphotectonic and sedimentological analyses. Our study suggests that divide migration leads to lowered erosion rates, channel narrowing, and sediment accretion in intermontane basins on the leeward-side ultimately resulting in enhanced flooding. The continued, yet variable rates of interactions between tectonic and climatic forcing result in diversity of landscape evolution. A number of physical and numerical models 1â4 have shown the effects of uplift and orographi-cally enhanced precipitation on the evolution of active mountain ranges. However, in a natural landscape, subject to tectonic uplift and climatic perturbations, the feedback of ridgelines and subsequent rain-shadowed topography remains less-understood. These natural processes, often aggravated by anthropogenic intervention can result in catastrophic geohazards such as flooding, causing irreversible damages. The consequences of floods include loss of human life, crops and livestock, and the spread of water borne diseases 5â7. Economic vulnerability arising from damage to infrastructure such as roads and bridges could have longâterm impacts causing disruption to transportation and emergency flood evacuation services. Thus, understanding the consequences of varied landscape evolution under the influences of tectonic and climatic forcing has critical inputs for mitigation of geohazards especially in tectonically dynamic, climatically sensitive and highly populated regions of the World such as Southeast Asia. NW Borneo (Fig. 1) is a typical example where floods have caused community disruptio