Morphometric parameters of the relief and drainage network of a tropical subbasin

IF 0.5 Q4 GEOGRAPHY, PHYSICAL

Revista Brasileira de Geomorfologia Pub Date : 2023-06-27 DOI:10.20502/rbg.v24i2.2311

Igor Luís Reis, Gustavo Sousa Marinho, Guilherme Da Silva Rios, Derielsen Brandão Santana, Guilherme Henrique Expedito Lense, Ronaldo Luiz Mincato, F. Rubira

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Abstract

This research analyzed the morphological/morphometric parameters of the relief and drainage network of the Formiga River subbasin, southern Minas Gerais State, Brazil. This study identified and examined the influences of control mechanisms in the development of current configurations. The methodology was based on the application of indices and parameters: (1) slope length (Hack's Sl); (2) normalized slope index (ksn); (3) river hierarchy; (4) drainage density; (5) hydrographic density; (6) sinuosity index; (7) density of structural lineaments; (8) transverse topographic symmetry factor; (9) asymmetry factor of drainage basins; (10) topographic profiles transverse to the valleys; (11) relief ratio; (12) roughness index; (13) roughness concentration index; (14) compactness coefficient; (15) circularity index and (16) form factor. The results indicated 3 sectors of the subbasin with distinct geomorphic behaviors, which resulted in peculiar surface structures and divergent current dynamics. The subbasin presents physical evidence that demonstrates and corroborates strong tectonic and structural control in the development of the current drainage network and relief. Human action has also affected, from the construction of dams, the dynamics of the lower course of the river, drowned by the reservoir of the hydroelectric plant of Furnas.

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热带次盆地地形和流域网络的形态计量参数

本研究分析了巴西米纳斯吉拉斯州南部Formiga河次流域地形和排水网络的形态/形态参数。这项研究确定并检验了控制机制对当前配置发展的影响。该方法基于指标和参数的应用：（1）斜坡长度（Hack’s Sl）；（2）归一化斜率指数；（3）河流等级；（4）排水密度；（5）水文密度；（6）弯度指数；（7）构造线理密度；（8）横向地形对称因子；（9）流域不对称因子；（10）横向于山谷的地形剖面图；（11）缓解率；（12）粗糙度指数；（13）粗糙度集中指数；（14）压实系数；（15）圆形指数和（16）形状因子。结果表明，该亚盆地的3个分区具有不同的地貌特征，形成了独特的地表结构和发散的水流动力学。该次盆地提供了物理证据，证明并证实了在当前排水网络和地形的发展中强有力的构造和结构控制。人类的行为也影响了大坝的建设，影响了被Furnas水电站水库淹没的河流下游的动态。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Revista Brasileira de Geomorfologia GEOGRAPHY, PHYSICAL-

CiteScore

1.30

自引率

40.00%

发文量

审稿时长

16 weeks

期刊介绍： The Revista Brasileira de Geomorfologia are focused on research, analysis and application of knowledge for the development of models of large sets of relief; fluvial dynamics; the processes of aspects, such as erosion and mass movements and their impact; survey, assessment and recovery of degraded areas; surveys and assessments of natural resources; thematic mapping and integrated relief; environmental zoning; among other relevant aspects of the land relief on any scale. From a technical and instrumental basis for the development of these studies, studies that use instruments to the survey, the interpretation and generalization of data on various aspects of the Earth''s surface, including the forms of occupation and use (s) company (s) human (s). As well as the use and integration of methods and techniques that enable geo technical and instrumental character important in scientific production and the definition of public policies.