应用层次分析法评估埃代阿-埃塞卡地区（喀麦隆西南部大西洋沿岸）流域系统的新构造变异性

IF 2.8 3区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Advances in Space Research Pub Date : 2024-08-22 DOI:10.1016/j.asr.2024.08.045

Moussa Nsangou Ngapna , Moïse Christian Balla Ateba , Sébastien Owona

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引用次数: 0

摘要

喀麦隆西南部大西洋沿岸复杂的地质和构造造就了今天埃代阿-埃塞卡地区（EER）的地貌。埃代阿-埃塞卡地区构造活跃，呈现出不同的构造隆起、地貌对比、侵蚀率变化、河流侵蚀和河道坡度。排水系统分界线是地貌的动态特征，在河网发展过程中随时间迁移。为了研究该地区的新构造变化，我们调查了整个 EER 地区的排水河流系统和活跃区域构造的地形表现。我们利用地理信息系统（GIS）解释技术，从数字高程模型（DEM，30 米像素分辨率）中提取了 32 个主要流域的 11 个形态参数，并将这些参数与分析层次过程（AHP）方法相结合。这些指标分为流域几何、地貌特征、排水质地分析和区域倾斜/隆起等四类，它们之间的相互关系可以确定区域构造活动对流域形状发展的影响。地貌分析结果表明，研究区域内的形态参数变化显著，显示出强烈的构造控制。根据 AHP 值，该地区被细分为高（∼25 %）、中（∼43.75 %）和低（∼31.25 %）区域构造等级。不同AHP等级的空间分布呈现出从沿海到腹地的渐变模式，表明EER流域系统的新构造活动逐渐减少（由西向东）。中度到高度的新构造活动（68.75%）显示了 EER 不稳定构造特征的复杂性，这是岩石圈地幔动力学/对流层上涌以及喀麦隆火山线（CVL）活动造成的。

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Application of Analytical Hierarchy Process in evaluation of neotectonic variability on drainage basin systems in the Edea – Eseka region (SW Cameroon Atlantic Coast)

Complex geology and tectonics of the SW Cameroon Atlantic Coast are responsible for the present-day landscapes of the Edea – Eseka Region (EER). The EER is tectonically active and shows differential tectonic uplift, contrasting relief, variations in erosion rates, in river incision, and in channel gradient. Drainage system divides are dynamic features of a landscape that migrate over time during the development of river networks. To study the neotectonic variability in this region, we investigate the drainage river system and the topographic expression of active regional tectonics across the EER. From the Digital elevation model (DEM, 30 m pixel resolution) using Geographic Information System (GIS) interpretive techniques, we extracted eleven morphometric parameters of thirty-two main drainage basins which were combined with Analytical Hierarchy Process (AHP) method. The inter-relationships between these indices grouped into four categories such as watershed geometry, relief characteristics, drainage texture analysis and regional tilting/uplift; can determine the influence of regional tectonic activity in the shape development of drainage basins. The results of the landscape analysis reveal significant variations of the morphometric parameters within the study area indicate a strong tectonic control. From the AHP values, the area is subdivided into high (∼25 %), moderate (∼43.75 %), and low (∼31.25 %) regional tectonic classes. The spatial distribution of different AHP classes shows a gradational pattern from coast to hinterland, suggesting a gradual decrease (from west to east) in the neotectonic activity in the EER drainage basin systems. The moderate-to-high neotectonic activity (∼68.75 %), demonstrates the complexity of the EER unstable tectonic character due to lithospheric mantle dynamism/asthenospheric upwelling as well as the Cameroon Volcanic Line (CVL) activity.

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来源期刊

Advances in Space Research 地学天文-地球科学综合

CiteScore

5.20

自引率

11.50%

发文量

800

审稿时长

5.8 months

期刊介绍： The COSPAR publication Advances in Space Research (ASR) is an open journal covering all areas of space research including: space studies of the Earth''s surface, meteorology, climate, the Earth-Moon system, planets and small bodies of the solar system, upper atmospheres, ionospheres and magnetospheres of the Earth and planets including reference atmospheres, space plasmas in the solar system, astrophysics from space, materials sciences in space, fundamental physics in space, space debris, space weather, Earth observations of space phenomena, etc. NB: Please note that manuscripts related to life sciences as related to space are no more accepted for submission to Advances in Space Research. Such manuscripts should now be submitted to the new COSPAR Journal Life Sciences in Space Research (LSSR). All submissions are reviewed by two scientists in the field. COSPAR is an interdisciplinary scientific organization concerned with the progress of space research on an international scale. Operating under the rules of ICSU, COSPAR ignores political considerations and considers all questions solely from the scientific viewpoint.