Morphosedimentary models of urban drainages in the coast of Vicente López applied to environmental management.

Abstract

Coastal systems are highly dynamic, and when modified by human activities, their behavior becomes difficult to predict. Morphodynamics and ecology are closely interconnected; therefore, effective management requires a comprehensive understanding of both aspects. This study analyzes the geomorphology and sedimentary dynamics of the fluvial channels formed by the progradation of the
Vicente López coast in the late 1990s. The results show that the sediments in these channels are mostly muddy sands with a high organic matter content and display sedimentary grading toward the mouth (estuary). Water quality varies seasonally: during summer, anoxic conditions, low oxygen levels, and high concentrations of nitrates and ammonium are recorded, whereas aerobic environments prevail during the rest of the year. During the extreme drought of 2023, no cyanobacterial blooms were observed; however, high levels of ammonium, biochemical oxygen demand (BOD), and chemical oxygen demand (COD) were detected, possibly linked to treated wastewater discharges. This study provides insights to support environmental management and promote the sustainable development of the Vicente López coastal corridor. The findings highlight the need to: (a) reduce effluent discharge into the channels, particularly during summer; (b) preserve riparian forests and stream systems that have developed over the past two decades; (c) regulate fishing activities at stream mouths; (d) implement management policies grounded in the geomorphological and ecological functions of the
streams; (e) prevent disturbance of bottom sediments; and (f) enhance public awareness of the ecological value of urban green spaces and their associated ecosystems.