Stormflow Response and “Effective” Hydraulic Conductivity of a Degraded Tropical <i>Imperata</i> Grassland Catchment as Evaluated With Two Infiltration Models

Zhuo, Cheng; Zhang, Jun; Yu, Bofu; Chappell, Nick A.; Meerveld, Ilja van; Bruijnzeel, L. A.

doi:10.1029/2022wr033625

Water Resources Research

2023

DOI: 10.1029/2022wr033625

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Stormflow Response and “Effective” Hydraulic Conductivity of a Degraded Tropical Imperata Grassland Catchment as Evaluated With Two Infiltration Models

Cheng Zhuo

Jun Zhang

Bofu Yu

et al.

Abstract: Some of the more frequently used approaches include the Green-Ampt infiltration model (GA) and the US Soil Conservation Service curve number (SCS-CN) method. GA partitions rainfall between infiltration and infiltration-excess overland flow (IOF) during ponding (Chu, 1978;

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Cited by 2 publications

References 124 publications

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Rainfall‐runoff responses and hillslope moisture thresholds for an upland tropical catchment in Eastern Madagascar subject to long‐term slash‐and‐burn practices

Zwartendijk,

van Meerveld,

Teuling

et al. 2023

Hydrological Processes

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Slash‐and‐burn agriculture is an important driver of tropical forest loss and typically results in a mosaic of land uses. However, there is little quantitative information about the hydrological effects of long‐term slash‐and‐burn agriculture and how such mosaics affect the rainfall‐runoff response at the catchment scale. We monitored streamflow responses at two points along a perennial stream in a 31.7 ha catchment in eastern Madagascar that was monitored previously between 1963 and 1972. Land cover in 2015 consisted of degraded grasslands, shrub and tree fallows at various stages of regrowth (64%), eucalypt stands for charcoal production (30%), and rice paddies and wetlands in the valley‐bottom (3%). For the majority (60%) of the events during the study period, the ratio between the total amount of stormflow and rainfall was <3%, suggesting that for these events runoff was generated in the valley‐bottom only. Events for which an antecedent soil moisture storage plus rainfall (ASI + P) threshold was exceeded had much higher stormflow ratios (up to 50%), indicating that a certain wetness was required for the hillslopes to contribute to stormflow. Stable isotope sampling for four small to moderate events indicated that stormflow was dominated by pre‐event water. Total stormflow and annual water yield in 2015 were higher than in the 1960s, despite much lower rainfall in 2015. We attribute these differences to changes in soil physical properties caused by the repeated burning and loss of top‐soil, which has resulted in a reduction in the depth to the impeding layer. The changed runoff‐processes (less infiltration, more saturation‐excess overland flow) thus affect local water resources.

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Rainfall‐runoff responses and hillslope moisture thresholds for an upland tropical catchment in Eastern Madagascar subject to long‐term slash‐and‐burn practices

Zwartendijk,

van Meerveld,

Teuling

et al. 2023

Hydrological Processes

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Gully regulates snowmelt runoff, sediment and nutrient loss processes in Mollisols region of Northeast China

Chen,

Guo,

Zhou

et al. 2024

Science of The Total Environment

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Stormflow Response and “Effective” Hydraulic Conductivity of a Degraded Tropical Imperata Grassland Catchment as Evaluated With Two Infiltration Models

Abstract: Some of the more frequently used approaches include the Green-Ampt infiltration model (GA) and the US Soil Conservation Service curve number (SCS-CN) method. GA partitions rainfall between infiltration and infiltration-excess overland flow (IOF) during ponding (Chu, 1978;

Cited by 2 publications

References 124 publications

Rainfall‐runoff responses and hillslope moisture thresholds for an upland tropical catchment in Eastern Madagascar subject to long‐term slash‐and‐burn practices

Rainfall‐runoff responses and hillslope moisture thresholds for an upland tropical catchment in Eastern Madagascar subject to long‐term slash‐and‐burn practices

Gully regulates snowmelt runoff, sediment and nutrient loss processes in Mollisols region of Northeast China

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