Refined conceptualization of TOPMODEL for shallow subsurface flows

Walter, M. Todd; Steenhuis, Tammo S.; Mehta, Vishal K.; Thongs, Dominique; Zion, Mark S.; Schneiderman, Elliot M.

doi:10.1002/hyp.5030

Cited by 83 publications

(61 citation statements)

References 16 publications

(33 reference statements)

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“…The revised TI that predicts the spatial distribution of runoff-contributing areas is approximated as follows [36]:…”

Section: Topographic Indexmentioning

confidence: 99%

“…One TI variant was to re-conceptualize TI using the soil moisture deficit instead of the water table depth as the state variable to make it applicable to shallow, interflow-driven watersheds in the US Northeast [36]. The revised TI has been extensively evaluated in terms of its ability to predict the spatial pattern of runoff-contributing areas, and to predict streamflow in the New York Catskill Mountains.…”

Section: Introductionmentioning

confidence: 99%

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Validation of a Locally Revised Topographic Index in Central New Jersey, USA

Qiu

2015

Water

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Saturation excess is a major runoff process in humid regions such as the US Northeast. Topographic index (TI) is used to simulate the pattern of runoff-contributing areas following a saturation excess runoff process. Although TI is useful to delineate saturated areas, i.e., hydrologically sensitive areas, for taking spatially distinctive actions in watersheds for improving water quality, local resource management practitioners often question its applicability to local conditions. This study introduces two methods to validate a locally revised TI in humid central New Jersey, USA. The revised TI uses soil moisture deficit instead of water table depth as the state variable in simulating the saturation excess runoff process. First, the calculated TI values were compared to the soil moisture measurements sampled in two sites in Tewksbury Township in the region to evaluate their correlations. Second, a watershed model Variable Source Load Function (VSLF) that incorporates TI was applied to the Neshanic River Watershed in the region and compared to another watershed model Soil and Water Assessment Tool (SWAT) to evaluate its capability in predicting the streamflow and its runoff and baseflow components. The positive correlations between soil moisture measurements and TI suggested TI is a good indicator of runoff-generating potential. VSLF achieves a modeling efficiency comparable to SWAT in simulating watershed hydrology. Such validation gives practitioners confidence to incorporate TI pattern into watershed management practices for improving their efficiency. The results are applicable to shallow, interflow-driven watersheds in humid regions. OPEN ACCESSWater 2015, 7 6617

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“…The revised TI that predicts the spatial distribution of runoff-contributing areas is approximated as follows [36]:…”

Section: Topographic Indexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Validation of a Locally Revised Topographic Index in Central New Jersey, USA

Qiu

2015

Water

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“…S 2 is the average of soil moisture deficit for the entire watershed. The soil moisture deficit is the reduced moisture deficit per unit volume of soil from saturation (Walter et al, 2002),…”

Section: Three-layer Structure and Model Formulationmentioning

confidence: 99%

“…humid tropical climate by Campling et al, 2002; mediterranean climate by Candela et al, 2005). Moreover, various modifications for subsurface flows had been proposed, such as Scanlon et al (2000), Hornberger et al (2001) and Walter et al (2002). On the other hand, in order to improve the estimation of surface flow convolution, routing procedure had also been introduced into TOP-MODEL to specify the drainage path and travel time of each cell (Candela et al, 2005).…”

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confidence: 99%

Simulating typhoon-induced storm hydrographs in subtropical mountainous watershed: an integrated 3-layer TOPMODEL

Huang

Lee

Kao

2009

Hydrol. Earth Syst. Sci.

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Abstract.A three-layer TOPMODEL is constructed by integrating diffusion wave approach into surface flow, soil moisture deficit into inter flow and exponential recession curve function into base flow. A subtropical mountainous watershed, Heng-Chi, and 22 rain storms with various rainfall types and wide ranges of total rainfall (from 81 to 1026 mm) were applied. The global best-fitted parameter set gives an average efficient coefficient of 82% for calibration and 80% for validation. Sensitivity analysis reveals that soil transmissivity dominates the discharge volume and recession coefficient dominates the hydrograph shape in TOPMODEL framework. Over 90% observed discharges of validation events falls within the 90% confidence interval derived form calibration events. The resembling performances between calibration and validation as well as good results of the confidence interval demonstrate the capability of 3-layer TOP-MODEL on simulating cyclones with various rainfall intensity and pattern in subtropical watershed. Meanwhile, the upper confidence limit is suggested preferably when considering flood assessment.

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“…Alguns estudos modificaram a equação original do IT em função da incorporação da transmissividade do solo (WALTER et al, 2002;LYON et al, 2004), alterações na forma de cálculo do gradiente hidráulico (HJERDT et al, 2004) ou ainda incorporando características físicas do solo na sua formulação (YU et al, 2016). Böhner & Selige (2006) Já as classes de uso da terra (Figura 3) predominantes são a mata nativa (Floresta Ombrófila Mista) com 51,9 %, reflorestamento de Pinus taeda com 27,8 % e áreas de campo com 15,1 % da área total da bacia.…”

Section: Introductionunclassified

Simulação Hidrogeomorfológica Da Dinâmica Das Áreas Saturadas Da Bacia Do Rio Corredeiras, Rio Negrinho - Sc

Hung

Siefert²,

Santos³

2017

Revista Ra'e Ga

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RESUMOA dinâmica espaço-temporal das áreas saturadas em bacias hidrográficas é controlada pela ocorrência de eventos pluviométricos e pelas características topográficas e físico-hídricas dos solos. Estas áreas atuam como fontes primárias de escoamento e o entendimento do seu comportamento hidrológico é fundamental para a descrição do funcionamento de bacias hidrográficas. Este artigo apresenta a avaliação e descrição dos padrões de umidade do solo na bacia do rio Corredeiras (117 km²), localizada na região sul brasileira, a partir da utilização do TOPMODEL em escala horária. Para o índice topográfico, utilizou-se e validou-se o algoritmo proposto por Böhner & Selige (2006) que considera um limite superior para as áreas de contribuição, minimizando valores de índice topograficamente inconsistentes. O modelo TOPMODEL foi calibrado de maneira semiautomática para simulação dos mecanismos de geração de escoamento em escala horária obtendo um COE médio de 0,7 para todo o período. As áreas saturadas variaram de 9% a 23% da área total da bacia. No processo de validação dos resultados da simulação em campo, o modelo foi capaz de representar as áreas com as maiores probabilidades de saturação, sobretudo em locais como as áreas de banhado permanentes, planícies fluviais dos canais de drenagem com grande área de contribuição e os terraços fluviais, além da ocorrência de áreas de saturação temporária que correspondem as porções de transição entre as vertentes e zonas ripárias. PALAVRAS-CHAVE: área variável de afluência, probabilidade de saturação, TOPMODEL. ABSTRACTSpatial and temporal dynamics of saturated areas on catchments are triggered by rainfall events and soil physical properties. Saturated areas are the main sources of runoff and understanding their hydrological behavior is essential for describe catchment functioning. Our work shows an assessment and a description of soil wetness patterns on Corredeiras river catchment (117 km²), in southern Brazil, through hydrological modelling approach with TOPMODEL on hourly resolution. For topographical index, we tested the Böhner & Selige (2006)'s algorithm, which uses an upper limit for delineating contribution area, decreasing the misrepresentation of topographical features. TOPMODEL was calibrated using a semi-automatic method for simulation of streamflow generation processes with a COE higher than 0,7. Saturated areas dynamics shows a variability of 9% up to 23% of the catchment area. A fieldwork was conducted for validation purposes of the results emphasizing the model ability to represent areas with higher probability of saturation mainly wetland areas, floodplains with large contribution areas and fluvial terraces and temporary saturated areas as hillslopes and riparian zones intersection. KEY-WORDS:variable source area, probability of saturation, TOPMODEL.

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Refined conceptualization of TOPMODEL for shallow subsurface flows

Cited by 83 publications

References 16 publications

Validation of a Locally Revised Topographic Index in Central New Jersey, USA

Validation of a Locally Revised Topographic Index in Central New Jersey, USA

Simulating typhoon-induced storm hydrographs in subtropical mountainous watershed: an integrated 3-layer TOPMODEL

Simulação Hidrogeomorfológica Da Dinâmica Das Áreas Saturadas Da Bacia Do Rio Corredeiras, Rio Negrinho - Sc

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