A new standard for estimating drainage basin shape

Chorley, Richard J.; Malm, Donald E. G.; Pogorzelski, H. A.

doi:10.2475/ajs.255.2.138

Cited by 209 publications

(74 citation statements)

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“…Apesar da abordagem quantitativa já ser consagrada na geomorfologia, com designação de geomorfometria, cuja definição já era apresentada em Chorley (1957), como a ciência que trata da geometria da paisagem e das tentativas de descrever quantitativamente a superfície da Terra. Na atualidade, amparada fortemente na modelagem digital, a geomorfometria é definida como a ciência da análise quantitativa da superfície terrestre (PIKE, 2000), que configura uma moderna abordagem analítico-cartográfica para representação da topografia da Terra por meio da manipulação computacional de valores de elevação do terreno (TOBLER, 2000).…”

Section: Introductionunclassified

Índice De Posição Topográfica (Ipt) Para Classificação Geomorfométrica Das Formas De Relevo No Estado Do Paraná - Brasil

Silveira

2017

Revista Ra'e Ga

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RESUMOA geomorfometria tem favorecido o tratamento quantitativo nos estudos e representação das formas do relevo, sobretudo a partir de parâmetros calculados de Modelos Digitais do Terreno (MDTs). Nessa perspectiva, o trabalho teve como objetivo realizar a classificação geomorfométrica automatizada das formas de relevo do Paraná, Brasil, por meio da aplicação do Índice de Posição Topográfica (IPT), seguido da avaliação de sua distribuição nas subunidades morfoesculturais do Mapa Geomorfológico do Paraná e análise da fidedignidade classificatória do método apoiado no reconhecimento de campo em cinco áreas amostrais distribuídas no território paranaense. O MDT com resolução de 20m, foi interpolado pelo método Topogrid da base planialtimétrica nas escalas 1:50.000 e 1:25.000. Conforme proposta aplicada, o IPT foi derivado da mensuração entre a diferença da elevação de um ponto central com a média da elevação do seu entorno a partir de um raio predeterminado. As dez formas de relevo resultantes são decorrentes da discretização amparada pelos valores de desvio padrão e da combinação de dois IPTs (um de detalhe, com janela circular de leitura com raio de 8 células, e outro generalizado com raio de 79 células). Os resultados demonstraram, numa perspectiva regional, que o emprego do IPT permitiu identificar arranjos distintos com padrões de formas de relevo predominantes que foram coincidentes com os limites pré-estabelecidos das subunidades morfoesculturais do estado. Na perspectiva local, as dez formas de relevo mapeadas foram condizentes com a realidade de campo em quatro recortes, sendo que um deles demonstrou limitação na representação do planalto de baixa declividade da região noroeste com as planícies, o que retrata a dificuldade da plena representação do relevo considerando os mesmos parâmetros indistintamente em todo o Paraná.. PALAVRAS-CHAVE:Análise Digital do Relevo; Geomorfometria; Modelo Digital do Terreno; Geomorfologia do Paraná. ABSTRACT The geomorphometry has favored the quantitative treatment in studies and representation of the landforms, mainly from calculated parameters of Digital Terrain Models (DTMs). From this perspective, this paper aims to carry out the automated geomorphometric classification of the landforms in the state of Paraná, Brazil, by applying the Topographic Position Index (TPI); followed by the evaluation of its distribution in the morpho-sculptural subunits in Paraná's Geomorphological Map, and an analysis of the classification reliability of the method supported by the field recognition in five sampled areas distributed throughout the state territory. The 20m resolution DTM was interpolated by the Topogrid method of the planialtimety baseline in the 1:50,000 and 1:25,000 scales. According to the applied proposal, TPI has derived from the measurement between the elevation difference of a central point and the elevation average of its neighboring from a predetermined radius. The 10 landforms resulting from the discretization supported by the standard deviation values and the combina...

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Section: Introductionunclassified

Índice De Posição Topográfica (Ipt) Para Classificação Geomorfométrica Das Formas De Relevo No Estado Do Paraná - Brasil

Silveira

2017

Revista Ra'e Ga

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“…Thus, the basin area is an essential component in hydrological processes [21]. In this context, Chorley et al [50] concluded that the maximum discharge of flood per unit area, is inversely related to the size of the drainage basin. The total drainage area for W. Wala is …”

Section: Basin Area (A) Basin Length (Lb) and Basin Perimeter (P)mentioning

confidence: 99%

Morphometric Assessment of Wadi Wala Watershed, Southern Jordan Using ASTER (DEM) and GIS

Farhan¹

2017

JGIS

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Morphometric analysis is of vital concern to understand hydromophological processes in a given watershed, and thus, it is a priority for assessing water resources in drainage basins. A morphometric analysis was conducted to identify the drainage properties of Wadi Wala and the 23 fourth-order subbasins. ASTER DEM data was employed to compile slope, elevation, and aspect maps. Arc GIS software was used to measure and calculate basic, derived and shape morphometric parameters. W. Wala is found to be a sixth-order drainage basin, and the drainage pattern is trellis to sub-trellis in the central and lower part of the catchment, whereas it is dendritic to sub-dendritic pattern in the southern and northern parts. The slopes of the catchment vary from 0˚ -5˚ to >35˚ in slope categories. Tectonic uplifting and tilting, lithology, structure and rejuvenation are the major factors controlling morphological variation over the watershed. The recognized fault systems are chiefly controlling the drainage pattern, and the elongated shape of the sub-basins is attributed to dense lineaments in the central and eastern parts of the watershed. The R b values for the entire catchment and the sub-catchments range from 2 to 7, with a mean of 4.55, which indicates the distortion of drainage pattern by geological structure. Hypsometric integral values are high for the W. Wala watershed and the sub-basins, where it ranges from 70% to 89%. High HI values indicate that drainage basins are at the youth-age stage of geomorphic development, and they are affected by tectonic uplifting, tilting, and the dominance of hillslope process. Variation in HI values is apparent between sub-basins located at the western part, or, the rejuvenated belt where HI values range from 85% to 89%. Whereas the HI values of the sub-basins located at the eastern part of the watershed, vary from 70% to 84%. Regression analysis reveals that R 2 values, which represent the degree of control of driving pa- Y. Farhan respectively (where the F-value is significant at 0.1% and 0.5% levels). Such results imply that the height of local base level (m), and the mean height (m) are the only morphometric driving parameters which have significant control on HI values in the W. Wala watershed. High annual soil loss and sediment load estimated recently, denote that the catchment is highly susceptible to surface erosion at present. Hence, the present study, and the resultant information would help to plan for efficient soil and water conservation measures to reduce soil erosion rates, conserve water, and to control sediment into W. Wala dam.

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“…In this regard, Chorley et al [74] and overgrazed areas which resulted in greater runoff and thus, more erosion and surface drainage lines [76].…”

Section: Basic Parametersmentioning

confidence: 99%

Prioritization of Promising Wadi Wala Watershed (Southern Jordan) Using GIS-Based Morphometric Analysis and Multivariate Statistics

Farhan¹,

Anbar²,

Zreqat³

et al. 2018

OJG

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GIS-based morphometric analysis was employed for prioritization of the Wadi Wala catchment, southern Jordan. Twenty three fourth-order sub-basins were prioritized based on morphometric analysis, then appropriate soil and water conservation measures were proposed. Digital Elevation Model (DEM) and Arc GIS were used to delineate watersheds and to extract the drainage networks, and other required thematic maps (elevation and slope). LANDSAT data was used to prepare land use/land cover map, and a soil map was digitized using Arc GIS software. Linear and shape parameters were computed to prioritize 23 sub-watersheds, and ranks were designated based on the calculated compound parameter (Cp). Sub-basins grouped under a high priority class are exposed to high erosion risk; thus, they are of high potential for applying soil and water conservation measures. The current study substantiates the capability of morphometric analysis method, and geospatial technology in watershed prioritization. The Discriminant Analysis (DA) employed validates the priority classes (high, moderate, and low priority) achieved based on morphometric analysis, where they found statistically distinct from each other. Thus, it can be concluded that prioritization based only on morphometric analysis method is consistent, reliable, and of high capacity using GIS platform. Priority map along with soil, land user/cover, and slope information will help decision makers to execute proper soil and water conservation programs in the rainfed highlands of Jordan.

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A new standard for estimating drainage basin shape

Cited by 209 publications

References 0 publications

Índice De Posição Topográfica (Ipt) Para Classificação Geomorfométrica Das Formas De Relevo No Estado Do Paraná - Brasil

Índice De Posição Topográfica (Ipt) Para Classificação Geomorfométrica Das Formas De Relevo No Estado Do Paraná - Brasil

Morphometric Assessment of Wadi Wala Watershed, Southern Jordan Using ASTER (DEM) and GIS

Prioritization of Promising Wadi Wala Watershed (Southern Jordan) Using GIS-Based Morphometric Analysis and Multivariate Statistics

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