Estimation of pumpage and recharge in alluvial fan topography under multiple irrigation practices

Chiang, Chung-Jung; Wang, Chung-Ho; Liu, Chen‐Wuing; Huang, Chien‐Lin; Liu, Hung-Jen

doi:10.1016/j.jhydrol.2012.11.014

Cited by 8 publications

(11 citation statements)

References 26 publications

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“…the Yellow River, Indus River, Syr Darya River, Diyala River, Euphrates, Nile, etc. (Cai et al, 2003;Heyvaert and Baeteman, 2008;Hesse and Baade, 2009;Ertsen, 2009Ertsen, , 2010Chen et al, 2012;Giosan et al, 2012, Hsu et al, 2013, Kidder and Liu, 2014Zhuang and Kidder, 2014;Heyvaert et al, 2014;Syvitski et al, 2014;Kidder and Zhuang, 2015;Wilkinson et al, 2015;Jotheri et al, 2016). Moreover, avulsions occur in different fluvial environments: on fans, where radial streams periodically relocate laterally; along braided and meandering floodplain channels; on large-scale and low-gradient megafans; and in deltaic environments where individual channels silt up (Törnqvist and Bridge, 2002;Slingerland and Smith, 2004;Heyvaert et al, 2011).…”

Section: Discussion and Conclusion -Human Impact And Avulsionmentioning

confidence: 99%

The role of long‐term human impact on avulsion and fan development

Heyvaert

Walstra

2016

Earth Surf Processes Landf

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This study aims to understand (mainly qualitatively) the long‐term role of human impact on avulsion processes and the development of fluvial (mega‐) fans in semi‐arid environments. In this paper we refer to human impact as the direct influences of actions on the river's hydraulics (i.e. flow regulation, flow diversion and channel engineering). In five case‐studies drawn from the Khuzestan plains in southwest Iran we have analysed the setup and triggering conditions of specific avulsions that occurred in the past (timescale of millennia) and identified the role of human interference in their causation. Our analysis is based on the integration of historical, archaeological, geomorphological and geological data. Through this study we demonstrate that avulsions in the Khuzestan plains are the result of long‐term and complex interplay between multiple human‐induced and natural causes. In similar ways human‐induced actions may play important roles during different phases of avulsion development. The ‘success‘ of an avulsion in the post‐triggering phase may be defined by human‐induced setup causes as well as morphodynamic processes. We suggest that present‐day flood events may be partly inherited from long‐term human alterations of the natural processes. These finding could have implications for any fluvial system (e.g. distributive fluvial systems, deltas) where avulsion plays a major role in their development and research tends to emphasize on natural mechanisms. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Discussion and Conclusion -Human Impact And Avulsionmentioning

confidence: 99%

The role of long‐term human impact on avulsion and fan development

Heyvaert

Walstra

2016

Earth Surf Processes Landf

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“…Step 1-3: In practical application, the spatiotemporal recharge pattern is estimated by multiplying the temporal pattern calculated by using the lumped storage hydrograph fluctuation and the previously estimated pumpage according to Hsu et al [16], with the initial guess of the spatial pattern estimated according to the factor loadings calculated from the computed distributed inflow hydrographs (∆storage + pumpage). The initial estimate of the hydrogeological parameters is assigned according to the in situ pumping tests.…”

Section: Procedures Of the Methodologymentioning

confidence: 99%

“…where h sim t,x,y (η) is the simulated groundwater head at an observation well based on an estimated value of η; q obs t s ,s f , f and q sim t s ,s f , f are the observed storage and the simulated storage, corresponding to the observed and simulated groundwater head of aquifer f in region s f for time step t s calculated according to Hsu et al [16], respectively; and F is the total number of aquifers. Equation (2b) assumes that a groundwater system has S f observation wells in aquifer f with several time steps T s , and uses M = T s × S f × F to represent subscript symbols q sim t s ,s f , f and q obs t s ,s f , f by single subscript symbols ϑ sim m and ϑ obs m .…”

Section: Proposing Optimization Model For Model Calibration In a Multmentioning

confidence: 99%

“…The groundwater system in the alluvial fan is approximately 330 m thick, which can be divided into four aquifers and three aquitards. The specific yield (S y ) of the unconfined aquifer at the apex of the fan is 0.137 to 0.237, and the storage coefficient of the confined aquifer varies from 10 −4 to 10 −3 [16]. Accordingly, the constructed conceptual groundwater flow model of the Cho-Shui River alluvial fan using MODFLOW-2005 is shown in Figure 6c.…”

Section: Study Areamentioning

confidence: 99%

“…The spatiotemporal patterns of pumpage and net recharge are mostly regarded as known [3][4][5][6][7][8][9][10][11][12][13][14][15]. If the pumpage and recharge spatiotemporal patterns are arbitrary, the calibrated model is subject to uncertainty [16]. Furthermore, previous studies on hydrogeological parameter identification are usually based on hypothetical cases, which seldom apply to large-scale complex groundwater systems.…”

Section: Introductionmentioning

confidence: 99%

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Symmetrical Rank-Three Vectorized Loading Scores Quasi-Newton for Identification of Hydrogeological Parameters and Spatiotemporal Recharges

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In a multi-layered groundwater model, achieving accurate spatiotemporal identification and solving the ill-posed problem is the vital topic for model calibration. This study proposes a symmetry rank three vectorized loading scores (SR3 VLS) quasi-Newton algorithm by modifying the Levenberg–Marquardt algorithm and importing a rank three structure from Broyden–Fletcher–Goldfarb–Shanno algorithm for identification of hydrogeological parameters and spatiotemporal recharge simultaneously. To accelerate directional convergence and approach a global optimum, this study uses a vectorized limited switchable step size in the transmissive groundwater inverse problem. The Hessian approximation rank three uses high and low-rank factor loading scores analyzed from simulated storage fluctuation between adjacent iterations for calculation and matrix correction. Two numerical experiments were designed to validate the proposing algorithm, showing the SR3 VLS quasi-Newton reduced the error percentages of the identified parameters by 1.63% and 9.65% compared to the Jacobian quasi-Newton. The proposing method is applied to the Chou-Shui River alluvial fan groundwater system in Taiwan. Results show that the simulated storage error decreased rapidly in six iterations, and has good head convergence as small as 0.11% with a root-mean-square-error (RMSE) of 0.134 m, indicating that the proposing algorithm reduces the computational cost to converge to the true solution.

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Independent component analysis for characterization and quantification of regional groundwater pumping

Liu

Yeh

2015

Journal of Hydrology

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Estimation of pumpage and recharge in alluvial fan topography under multiple irrigation practices

Cited by 8 publications

References 26 publications

The role of long‐term human impact on avulsion and fan development

The role of long‐term human impact on avulsion and fan development

Symmetrical Rank-Three Vectorized Loading Scores Quasi-Newton for Identification of Hydrogeological Parameters and Spatiotemporal Recharges

Independent component analysis for characterization and quantification of regional groundwater pumping

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