The geomorphological and ecological functioning of the Silala River

IF 6.8 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES Wiley Interdisciplinary Reviews: Water Pub Date : 2023-09-11 DOI:10.1002/wat2.1691
Luca Mao
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引用次数: 1

Abstract

Abstract Perennial rivers in desert regions are relevant environments that tend to concentrate most ecosystem services and values, but are not as studied as much as intermittent and ephemeral rivers. This article reports on the main morphological and ecological features of the Silala River, a narrow permanent river in the arid region of Antofagasta, in the north of Chile. The study was motivated by the dispute between Chile and Bolivia concerning the status of the Silala as an international watercourse. Field surveys of sediment transport using traps and marked sediments (colored and tagged clasts) revealed that finer sediments are moved in higher percentages and for longer distances than coarser sediment fractions, which corroborates the size‐selective nature of sediment dynamics in the river. The stream features the typical step/pool‐plane bed morphology that is to be expected in an alluvial river with the given boundary conditions of slope, grain size of sediments, and lateral confinement. Furthermore, the Morphological Quality Index (MQI) classifies the river as featuring overall good morphological conditions and the river hosts an abundant population of rainbow trout ( Oncorhynchus mykiss ). Although this is a non‐native species, their presence shows that the general conditions of the river (availability of food and presence of aquatic habitats) are able to sustain a population of resident fish. Overall, the morphological forms, geomorphic processes, and ecological features of the Silala River are typical of an alluvial stream with a permanent flow regime. This article is categorized under: Science of Water > Water and Environmental Change Human Water > Rights to Water Science of Water > Hydrological Processes Water and Life > Nature of Freshwater Ecosystems
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希拉拉河的地貌与生态功能
沙漠地区多年生河流是集中了大部分生态系统服务和价值的相关环境,但研究较少。这篇文章报道了西拉拉河的主要形态和生态特征,这是一条狭窄的永久河流,位于智利北部的安托法加斯塔干旱地区。这项研究的动机是智利和玻利维亚之间关于西拉拉作为国际水道地位的争端。利用捕集器和标记沉积物(彩色和标记的碎屑)进行的沉积物运输实地调查显示,较细的沉积物比粗的沉积物组分移动的百分比更高,距离更远,这证实了河流中沉积物动力学的大小选择性。该河流具有典型的台阶/池-平面河床形态,这是在给定斜坡、沉积物粒度和侧向约束的边界条件下冲积河流中所期望的。此外,形态质量指数(MQI)将河流分类为整体形态条件良好,河流拥有丰富的虹鳟鱼(Oncorhynchus mykiss)种群。虽然这是一种非本地物种,但它们的存在表明,河流的一般条件(食物的可用性和水生栖息地的存在)能够维持一个常驻鱼类的种群。总的来说,西拉拉河的形态形态、地貌过程和生态特征是典型的冲积河,具有永久的流态。本文分类如下:水科学;水与环境变化水权;水科学;水文过程水与生命淡水生态系统的性质
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来源期刊
Wiley Interdisciplinary Reviews: Water
Wiley Interdisciplinary Reviews: Water Environmental Science-Ecology
CiteScore
16.60
自引率
3.70%
发文量
56
期刊介绍: The WIREs series is truly unique, blending the best aspects of encyclopedic reference works and review journals into a dynamic online format. These remarkable resources foster a research culture that transcends disciplinary boundaries, all while upholding the utmost scientific and presentation excellence. However, they go beyond traditional publications and are, in essence, ever-evolving databases of the latest cutting-edge reviews.
期刊最新文献
Holocene sedimentary history of the Silala River (Antofagasta Region, Chile) Advances and gaps in the science and practice of impact‐based forecasting of droughts The geological evolution of the Silala River basin, Central Andes Hydrogeological characterization of the Silala River catchment Hydrological modeling of the Silala River basin. 2. Validation of hydrological fluxes with contemporary data
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