A sensitivity analysis of Hortonian flow

Delfs, Jens-Olaf; Park, C.-H.; Kolditz, Olaf

doi:10.1016/j.advwatres.2009.06.005

Cited by 43 publications

(33 citation statements)

References 38 publications

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“…OGS has a built-in random-walk particle tracking method for Euler-Lagrange simulations [97] and can simulate incompressible and compressible flow [98], densitydependent flow [99], unsaturated flow [100], two-phase flow [101,102], and overland flow [103]. All flow model components are available for non-isothermal conditions and for deformable porous media.…”

Section: Opengeosysmentioning

confidence: 99%

Reactive transport codes for subsurface environmental simulation

et al. 2014

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A general description of the mathematical and numerical formulations used in modern numerical reactive transport codes relevant for subsurface environmental simulations is presented. The formulations are followed by short descriptions of commonly used and available subsurface simulators that consider continuum representations of flow, transport, and reactions in porous media. These formulations are applicable to most of the subsurface environmental benchmark problems included in this special issue. The list of codes described briefly here includes PHREEQC, HPx, PHT3D, OpenGeoSys (OGS), HYTEC, ORCHESTRA, TOUGHREACT, eSTOMP, HYDROGEOCHEM, CrunchFlow, MIN3P, and PFLOTRAN. The descriptions include a C. I. Steefel ( ) · B. Arora · S. Molins · N. Spycher

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Section: Opengeosysmentioning

confidence: 99%

Reactive transport codes for subsurface environmental simulation

et al. 2014

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“…Beyond the type of degradation of the watershed that, mostly through soil compaction, leads to enhanced infiltrationexcess (or Hortonian) overland flow (Delfs et al, 2009), saturated conditions throughout the soil profile may also induce overland flow, especially near valley bottoms (Bonell, 1993;Bruijnzeel, 2004). Thus, the value of F p,o can be substantially above zero if the rainfall has a significant temporal autocorrelation, with heavy rainfall on subsequent days being more likely than would be expected from general rainfall frequencies.…”

Section: Flow-pathway Dependence Of Flow Persistencementioning

confidence: 99%

Flood risk reduction and flow buffering as ecosystem services – Part 1: Theory on flow persistence, flashiness and base flow

Noordwijk

Tanika²,

Lusiana³

2017

Hydrol. Earth Syst. Sci.

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Abstract. Flood damage reflects insufficient adaptation of human presence and activity to location and variability of river flow in a given climate. Flood risk increases when landscapes degrade, counteracted or aggravated by engineering solutions. Efforts to maintain and restore buffering as an ecosystem function may help adaptation to climate change, but this require quantification of effectiveness in their specific social-ecological context. However, the specific role of forests, trees, soil and drainage pathways in flow buffering, given geology, land form and climate, remains controversial. When complementing the scarce heavily instrumented catchments with reliable long-term data, especially in the tropics, there is a need for metrics for data-sparse conditions. We present and discuss a flow persistence metric that relates transmission to river flow of peak rainfall events to the base-flow component of the water balance. The dimensionless flow persistence parameter F p is defined in a recursive flow model and can be estimated from limited time series of observed daily flow, without requiring knowledge of spatially distributed rainfall upstream. The F p metric (or its change over time from what appears to be the local norm) matches local knowledge concepts. Inter-annual variation in the F p metric in sample watersheds correlates with variation in the "flashiness index" used in existing watershed health monitoring programmes, but the relationship between these metrics varies with context. Inter-annual variation in F p also correlates with common base-flow indicators, but again in a way that varies between watersheds. Further exploration of the responsiveness of F p in watersheds with different characteristics to the interaction of land cover and the specific realisation of space-time patterns of rainfall in a limited observation period is needed to evaluate interpretation of F p as an indicator of anthropogenic changes in watershed conditions.

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“…Soil‐water retention parameters were given as

θ_{s} = 0.42

θ_{r} = 0.05

K_{s} = 2.833 \times 10^{- 5} m / s

α = 6 m^{- 1}

, and

n_{v} = 4

, as given by Delfs et al . []. The dry initial condition,

ψ_{i n i t} = - 2 m

, was set and a rainfall intensity of

7 \times 10^{- 5} m / s

covered the full 15 min of the simulation.…”

Section: Model Verificationmentioning

confidence: 99%

Finite volume integrated surface‐subsurface flow modeling on nonorthogonal grids

2014

Water Resources Research

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In this paper, we present an innovative finite volume surface-subsurface integrated flow model on nonorthogonal grids. The shallow water equation with diffusion wave approximation is used to formulate the surface flow system, while the Richards' equation is used to formulate the saturatedunsaturated subsurface flow system. These two flow systems are discretized using a finite volume method and are then coupled by enforcing the continuity of pressure and flux at the surface-subsurface interface, which does not require unphysical parameters such as the interface permeability and thickness. The numerical instability caused by enforcing the continuity of pressure and flux at the interface is resolved using a cell-centered finite volume discretization. The coupled systems are solved simultaneously by the Newton iterative method. A battery of benchmark analyses and laboratory experiments verify the proposed model's superior performance relative to existing models. Two numerical experiments over irregular terrain show that the nonorthogonal grids and diffusive wave approximation used in the proposed model accurately represent the interaction between surface and subsurface flows for irregular topographies. In particular, they capture the significant topographical effects on runoff discharges, especially where gentle slopes are involved.

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A sensitivity analysis of Hortonian flow

Cited by 43 publications

References 38 publications

Reactive transport codes for subsurface environmental simulation

Reactive transport codes for subsurface environmental simulation

Flood risk reduction and flow buffering as ecosystem services – Part 1: Theory on flow persistence, flashiness and base flow

Finite volume integrated surface‐subsurface flow modeling on nonorthogonal grids

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