Overland flow generation on hillslopes of complex topography: analytical solutions

2007 ◽  
Vol 21 (10) ◽  
pp. 1308-1317 ◽  
Author(s):  
Carmelo Agnese ◽  
Giorgio Baiamonte ◽  
Cecilia Corrao
Keyword(s):  
Analytical Solutions ◽  
Overland Flow ◽  
Complex Topography ◽  
Flow Generation

scholarly journals Incipient subsurface heterogeneity and its effect on overland flow generation – insight from a modeling study of the first experiment at the Biosphere 2 Landscape Evolution Observatory

2014 ◽  
Vol 18 (5) ◽  
pp. 1873-1883 ◽  
Author(s):  
G.-Y. Niu ◽  
D. Pasetto ◽  
C. Scudeler ◽  
C. Paniconi ◽  
M. Putti ◽  
...  
Keyword(s):  
Null Hypothesis ◽  
Overland Flow ◽  
Landscape Evolution ◽  
Alternative Hypothesis ◽  
Biosphere 2 ◽  
Subsurface Heterogeneity ◽  
Flow Generation ◽  
Heterogeneous Soil ◽  
Seepage Face ◽  
Modeling Study

Abstract. Evolution of landscape heterogeneity is controlled by coupled Earth system dynamics, and the resulting process complexity is a major hurdle to cross towards a unified theory of catchment hydrology. The Biosphere 2 Landscape Evolution Observatory (LEO), a 334.5 m2 artificial hillslope built with homogeneous soil, may have evolved into heterogeneous soil during the first experiment driven by an intense rainfall event. The experiment produced predominantly seepage face water outflow, but also generated overland flow, causing superficial erosion and the formation of a small channel. In this paper, we explore the hypothesis of incipient heterogeneity development in LEO and its effect on overland flow generation by comparing the modeling results from a three-dimensional physically based hydrological model with measurements of total mass change and seepage face flow. Our null hypothesis is that the soil is hydraulically homogeneous, while the alternative hypothesis is that LEO developed downstream heterogeneity from transport of fine sediments driven by saturated subsurface flow. The heterogeneous case is modeled by assigning saturated hydraulic conductivity at the LEO seepage face (Ksat,sf) different from that of the rest (Ksat). A range of values for Ksat, Ksat,sf, soil porosity, and pore size distribution is used to account for uncertainties in estimating these parameters, resulting in more than 20 000 simulations. It is found that the best runs under the heterogeneous soil hypothesis produce smaller errors than those under the null hypothesis, and that the heterogeneous runs yield a higher probability of best model performance than the homogeneous runs. These results support the alternative hypothesis of localized incipient heterogeneity of the LEO soil, which facilitated generation of overland flow. This modeling study of the first LEO experiment suggests an important role of coupled water and sediment transport processes in the evolution of subsurface heterogeneity and on overland flow generation, highlighting the need of a coupled modeling system that integrates across disciplinary processes.

Quantification of Hortonian overland flow generation and soil erosion in a Central European low mountain range using rainfall experiments

CATENA ◽  
2014 ◽  
Vol 113 ◽  
pp. 202-212 ◽  
Author(s):  
V. Butzen ◽  
M. Seeger ◽  
S. Wirtz ◽  
M. Huemann ◽  
C. Mueller ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Overland Flow ◽  
Mountain Range ◽  
Central European ◽  
Flow Generation ◽  
Low Mountain Range

Effect of forest thinning on overland flow generation on hillslopes covered by Japanese cypress

Ecohydrology ◽  
2010 ◽  
Vol 4 (3) ◽  
pp. 367-378 ◽  
Author(s):  
Bui Xuan Dung ◽  
Shusuke Miyata ◽  
Takashi Gomi
Keyword(s):  
Overland Flow ◽  
Japanese Cypress ◽  
Forest Thinning ◽  
Flow Generation

Overland flow generation in two lithologically distinct rainforest catchments

2004 ◽  
Vol 295 (1-4) ◽  
pp. 276-290 ◽  
Author(s):  
S Godsey ◽  
H Elsenbeer ◽  
R Stallard
Keyword(s):  
Overland Flow ◽  
Flow Generation

Overland flow generation processes, erosion yields and solute loss following different intensity fires

2004 ◽  
Vol 37 (3) ◽  
pp. 233-240 ◽  
Author(s):  
Celeste de Oliveira Alves Coelho ◽  
António José Dinis Ferreira ◽  
Anne-Karine Boulet ◽  
Jan Jacob Keizer
Keyword(s):  
Overland Flow ◽  
Flow Generation

Accurate Determination of Overland Flow Trajectories in Simulated Watersheds of Complex Topography

1997 ◽  
Vol 73 (1) ◽  
pp. 163-166 ◽  
Author(s):  
N. Catsaros ◽  
C. Mita ◽  
P. Deligiannis ◽  
M. Varvayanni ◽  
J.C. Statharas ◽  
...  
Keyword(s):  
Overland Flow ◽  
Accurate Determination ◽  
Complex Topography
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