Effects of hillslope geometry on surface and subsurface flows

Sabzevari, T.; Noroozpour, S.

doi:10.1007/s10040-014-1149-6

Cited by 23 publications

(8 citation statements)

References 33 publications

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“…Actually, the direction of the flow on the hillslope could vary depending on the local topography. It is generally known that the oblique flow direction from hillslope to channel is common in the upstream basin, while the perpendicular direction is common in the downstream basin [57][58][59][60][61][62]. These two assumptions are very common in analytical studies of unit hydrographs [63][64][65][66][67][68].…”

Section: Time-area Curve Of An Ellipsementioning

confidence: 99%

Hillslope Contribution to the Clark Instantaneous Unit Hydrograph: Application to the Seolmacheon Basin, Korea

Yoo

Doan

Jun

et al. 2021

Water

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In this study, the time–area curve of an ellipse is analytically derived by considering flow velocities within both channel and hillslope. The Clark IUH is also derived analytically by solving the continuity equation with the input of the derived time–area curve to the linear reservoir. The derived Clark IUH is then evaluated by application to the Seolmacheon basin, a small mountainous basin in Korea. The findings in this study are summarized as follows. (1) The time–area curve of a basin can more realistically be derived by considering both the channel and hillslope velocities. The role of the hillslope velocity can also be easily confirmed by analyzing the derived time–area curve. (2) The analytically derived Clark IUH shows the relative roles of the hillslope velocity and the storage coefficient. Under the condition that the channel velocity remains unchanged, the hillslope velocity controls the runoff peak flow and the concentration time. On the other hand, the effect of the storage coefficient can be found in the runoff peak flow and peak time, as well as in the falling limb of the runoff hydrograph. These findings are also confirmed in the analysis of rainfall–runoff events of the Seolmacheon basin. (3) The effect of the hillslope velocity varies considerably depending on the rainfall events, which is also found to be mostly dependent upon the maximum rainfall intensity.

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Section: Time-area Curve Of An Ellipsementioning

confidence: 99%

Hillslope Contribution to the Clark Instantaneous Unit Hydrograph: Application to the Seolmacheon Basin, Korea

Yoo

Doan

Jun

et al. 2021

Water

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“…Numerical methods give good accuracy, but most hydrologists want simpler methods. Some hydrological models have also been used to estimate SSF (Robinson and Sivapalan 1996;Lee and Chang 2005;Sabzevari et al 2013;Sabzevari and Noroozpour, 2014). Lee and Chang (2005) developed the geomorphological instantaneous unit hydrograph (GIUH) model for predicting SSF.…”

Section: Introductionmentioning

confidence: 99%

“…Sabzevari et al (2013) applied the modified model in the Kasilian catchment, Iran, to separate SF and SSF. Sabzevari and Noroozpour (2014) examined the role of hillslope shape and profile curvature on SF and SSF in complex hillslopes and applied a new complex saturation model to separate the saturation region. They used the model to estimate SSF in a small basin, No.…”

Section: Introductionmentioning

confidence: 99%

Separation of surface flow from subsurface flow in catchments using runoff coefficient

et al. 2021

Self Cite

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Separating surface flow (SF) from subsurface flow (SSF) based on direct runoff measurements in river gauges is an important issue in hydrology. In this study, we developed a simple and practical method, based on runoff coefficient (RC), for separating SF from SSF. RC depends mainly on soil texture, land use and land cover, but we also considered the effect of slope and rainfall intensity. We assessed our RC-based method for three different soil types by comparing the value obtained with laboratory rainfall simulator data. The correlation coefficient between observed and calculated data exceeded 0.93 and 0.63 when estimating SF and SSF respectively .The method was then used to separate SF and SSF in two catchments (Heng-Chi and San-Hsia) in Northern Taiwan, and the results were compared with those produced by the geomorphological instantaneous unit hydrograph (GIUH) model. Test revealed that, if RC is calculated accurately, the proposed method can satisfactorily separate SF from SSF at catchment scale .

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“…Park et al (2001) accounted for the effect of topography by classifying complex slopes with six landscape units. Many studies have been performed as to the effect of hillslope geometry on subsurface flow and saturation on complex hillslopes (Ogden and Watts, 2000, Troch et al, 2002, Aryal et al, 2005Berne et al, 2005;Sabzevari and Noroozpour, 2014;Liang andChan, 2017, Fariborzi et al, 2019;Pishvaei et al, 2020). presented some equations to estimate the length of the saturated zone and the rate of saturation on complex hillslopes.…”

Section: Introductionmentioning

confidence: 99%

Shallow Landslide Modeling in Complex Hillslope by Using TOPMODEL and SINMAP Models

Bahmani

Fattahi

Sabzevari

et al. 2021

Preprint

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Every year many watershed hillslopes are displaced by landslides resulting from deforestation or rainfall-induced saturation. This destruction can lead to extensive loss of life and property damage if it occurs in the vicinity of roads or buildings. The intensity of landslides depends on the degree of saturation influenced by infiltration, hillslope geometry, and soil characteristics. This research's main purpose is to investigate the effect of two features of geometry, the plan shape (convergence and divergence) and profile curvature (convexity and concavity) on the stability of complex hillslopes. TOPMODEL is a hydrological subsurface flow model that can predict the magnitude of saturation and soil moisture deficit at any watershed point. In this research, TOPMODEL equations were developed so that the geometry of hillslopes could be considered. The saturation index in TOPMODEL was linked to SINMAP slope stability model to estimate the stability of different points of the complex hillslope. It was concluded that convex hillslopes are more stable than concave ones. Moreover, divergent hillslopes showed less sensitivity to land sliding compared to convergent ones. All in all the minimum stability was corresponding to the divergent convex hillslope. Finally, the effect of some other geometric parameters (e.g. slope angle, profile curvature parameter, and plan shape) on the stability of hillslopes was examined.

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Effects of hillslope geometry on surface and subsurface flows

Cited by 23 publications

References 33 publications

Hillslope Contribution to the Clark Instantaneous Unit Hydrograph: Application to the Seolmacheon Basin, Korea

Hillslope Contribution to the Clark Instantaneous Unit Hydrograph: Application to the Seolmacheon Basin, Korea

Separation of surface flow from subsurface flow in catchments using runoff coefficient

Shallow Landslide Modeling in Complex Hillslope by Using TOPMODEL and SINMAP Models

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