World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Assessing the Reduction of the Hydrological Connectivity of Gully Systems Through Vegetation Restoration: Field Experiments and Numerical Modelling : Volume 13, Issue 10 (12/10/2009)

By Molina, A.

Click here to view

Book Id: WPLBN0003980028
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: Assessing the Reduction of the Hydrological Connectivity of Gully Systems Through Vegetation Restoration: Field Experiments and Numerical Modelling : Volume 13, Issue 10 (12/10/2009)  
Author: Molina, A.
Volume: Vol. 13, Issue 10
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Den Putte, A. V., Poesen, J., Molina, A., Vanacker, V., & Govers, G. (2009). Assessing the Reduction of the Hydrological Connectivity of Gully Systems Through Vegetation Restoration: Field Experiments and Numerical Modelling : Volume 13, Issue 10 (12/10/2009). Retrieved from

Description: Physical and Regional Geography Research Group, Katholieke Universiteit Leuven, Celestijnenlaan 200E, 3001 Heverlee, Belgium. Restoration of degraded land in the Southern Ecuadorian Andes has led to alterations in the functioning of degraded catchments. Recovery of vegetation on areas affected by overgrazing, as well as the reforestation or afforestation of gully areas have given rise to modifications of hydrological connectivity within the catchments. Recent research has highlighted the ability of gully channels to trap sediment eroded from steep slopes, especially if vegetation is established along the gully bed. However, vegetation cover not only induces sediment deposition in the gully bed, but may also have a potential to reduce runoff water volume. The performance of gully beds in reducing the transfer of runoff was investigated by conducting controlled concentrated flow experiments in the field. Experimental field data for nine gullies were derived by pouring concentrated inflow into the upstream end and measuring the outflow at the downstream end of the channel. Two consecutive flow experiments per gully were carried out, so that data for dry and wet soil conditions were collected. The hydrological response to concentrated flow was estimated for each experiment by calculating its cumulative infiltration coefficient, IC (%). The results showed a great difference in IC between dry and wet soil conditions. The IC for wet soil conditions was on average 24%, whereas it was 60% for dry conditions. Gullies with more than 50% surface vegetation cover exhibit the highest cumulative infiltration coefficients (81% for dry runs, and 34% for wet runs), but runoff transmission losses were not as clearly related to vegetation cover as sediment storage as shown in Molina et al. (2009). The experimental field data of 16 experiments were used to calibrate a hydrological model developed by Fiener and Auerswald (2005) in order to simulate the transfer of concentrated flow along the gully beds. The calibrated model was able to simulate the transfer of runoff water well, as the error on the simulated total outflow volumes is below 13% for 15 out of 16 cases. However, predicting infiltration amounts is difficult: the high sensitivity of model results to some crucial hydraulic parameters (runoff width, hydraulic conductivity and sorptivity) is one of the reasons why the relationships between model parameter values and gully features are relatively weak.

The results obtained from the field experiments show that gully systems are key elements in the hydrological connectivity of degraded landscapes. The transfer of overland flow and sediment from the slopes towards the river system highly depends on the presence/absence of vegetation in the gully beds and should therefore be accounted for in assessments of landscape degradation and/or recovery.

Assessing the reduction of the hydrological connectivity of gully systems through vegetation restoration: field experiments and numerical modelling

Beven, K.: Linking parameters across scales: Subgrid parameterizations and scale dependent hydrological models, Hydrol. Process., 9, 507–525, 1995.; Beck, E., Bendix, J., Kottke, I., Makeschin, F., and Mosandl, R.: Gradients in a Tropical Mountain Ecosystem of Ecuador, Ecological Studies Series 198, Springer Scientific, Berlin, 528 pp., 2008.; Bracken, L. J. and Croke, J.: The concept of hydrological connectivity and its contribution to understand runoff-dominated geomorphic systems, Hydrol. Process., 21, 1749–1763, 2007.; Bruijnzeel, L. A.: Hydrological functions of tropical forests: not seeing the soils for the trees?, Agr. Ecosyst. Environ., 104, 185–228, 2004.; Chow, V. T., Maidment, D. R., and Mays, L. W.: Applied Hydrology, McGraw-Hill, USA, 572 pp., 1988.; Cowan, W. L.: Estimating hydraulic roughness coefficients, Agr. Eng., 37, 473–475, 1956.; Croke, J., Mockler, S., Fogarty, P., and Takken, I.: Sediment concentration changes in runoff pathways from a forest road network and the resultant spatial pattern of catchment connectivity, Geomorphology, 68, 257–268, 2005.; Deletic, A.: Modelling of water and sediment transport over grassed areas, J. Hydrol., 248, 168–182, 2001.; Dercon, G., Bossuyt, B., De Bièvre, B., Cisneros, F., and Deckers, J.: Zonificación Agro-ecologica del Austro Ecuatoriano, Programa para el Manejo del Agua y Suelo (PROMAS), Cuenca, Ecuador, 1998.; Fiener, P. and Auerswald, K.: Effectiveness of grassed waterways in reducing runoff and sediment delivery from agricultural watersheds, J. Environ. Qual., 32, 927–936, 2003.; Fiener, P. and Auerswald, K.: Measurement and modeling of concentrated runoff in grassed waterways, J. Hydrol., 301, 198–215, 2005.; Gimenez, R. and Govers, G.: Interaction between bed roughness and flow hydraulics in eroding rills, Water Resour. Res., 37, 791–799, 2001.; Govers, G., Gimenez, R., and Van Oost, K.: Rill erosion: Exploring the relationship between experiments, modelling and field observation, Earth-Sci. Rev., 84, 87–102, 2007.; Harden, C. P.: Andean soil erosion: A comparison of soil erosion conditions in two Andean watersheds, Natl. Geogr. Res., 7(2), 216–231, 1991.; Harden, C. P.: Interrelationship between land abandonment and land degradation: a case from the Ecuadorian Andes, Mt. Res. Dev., 16, 274–280, 1996.; Harden, C. P.: Human impacts on headwater fluvial systems in the Northern and Central Andes, Geomorphology, 79, 249–263, 2006.; Hillel, D.: Environmental Soil Physics, Academic Press, San Diego, CA, 1998.; Hungerbühler, D., Steinmann, M., Winkler, W., Seward, D., Eguez, D., Eguez, A., Peterson, D. E., Helg, U., and Hammer, C.: Neogene stratigraphy and Andean geodynamics of southern Ecuador, Earth-Sci. Rev., 57, 75–124, 2002.; Jaber, F. H., and Mohtar, R. H.: Stability and accuracy of finite element schemes for the one-dimensional kinematic wave solution, Adv. Water Resour., 25, 427–438, 2002.; Janeau, J. L., Bricquet, J. P., Planchon, O., and Valentin, C.: Soil crusting and infiltration on steep slopes in northern Thailand, Eur. J. Soil Sci., 54, 543–553, 2003.; Le Bissonnais, Y., Lecomte, V., and Cerdan, O.: Grass strip effects on runoff and soil loss, Agronomie, 24, 129–136, 2004.; Lighthill, M. J. and Woolhiser, D. A.: Modern approach to design of grassed channels, J. Irrigat. Drain. Eng. ASCE., 118, 733–743, 1955.; Lopez, F. and Garcia, M. H.: Mean flow and turbulent structure of open-channel flow through non-emergent vegetation, J. Hydraul. Eng., 127, 392–402, 2001.; Molina, A., Govers, G., Vanacker, V., Poesen, J., Zeelmaekers, E., and Cisneros, F.: Runoff generation in a degraded Andean ecosystem: Interaction of vegetation cover and land use, Catena, 71, 357–370, 2007.; Molina, A., Govers, G., Cisneros, F., and Vanacker, V.: Vegetation and topographic controls on sediment deposition and storage on gully beds in a degraded mountain area, Earth Surface Processes and Landforms, 34, 755–767, doi:10.1002/esp.1747, 2009.; Muñoz-Carpena, R., P


Click To View

Additional Books

  • Relating Surface Backscatter Response fr... (by )
  • Multi-scale Estimation of Surface Moistu... (by )
  • Estimation of Forest Structure Metrics R... (by )
  • Selection of Intense Rainfall Events Bas... (by )
  • Technical Note: on the Matt–shuttleworth... (by )
  • The Potential Value of Seasonal Forecast... (by )
  • Physical Models for Class-room Teaching ... (by )
  • Uncertainties Associated with Digital El... (by )
  • Flow Resistance of Vegetated Oblique Wei... (by )
  • Snow Cover Dynamics and Hydrological Reg... (by )
  • The Relevance of Glacier Melt in the Wat... (by )
  • Record Extension for Short-gauged Water ... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.