Mechanism of the Rapid Shrinkage of Limboto Lake in Gorontalo, Indonesia

Satomi Kimijima,Masayuki Sakakibara,Abd Kadir Mubarak A Amin,Yayu Indriati Arifin,Masahiko Nagai

doi:10.3390/su12229598

Satomi Kimijima, Masayuki Sakakibara + Show 3 more

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https://doi.org/10.3390/su12229598

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Abstract

This study explores the mechanisms behind the rapid shrinkage of Limboto Lake, Gorontalo, Indonesia, using remotely sensed imagery and river outcrop investigation data. The results show that more than 70% of the sedimentation resulting in shrinkage is contributed by riverbank erosion causing rivers to drain into the lake during the period 2003–2017. From geological investigation, it is found that the lowland area to the west of Limboto Lake comprises 1 m of flood sediments, followed by at least 5 m of fine-grained inner bay sediments. Severe riverbank erosion is also observed at many points. Hence, it is concluded that the shrinkage of Limboto Lake resulted from rapid-induced rapid erosion of inner bay sediments formed during plate collision which readily flowed into and were deposited in Limboto Lake; this created a delta, especially on the west side of the lake. Accelerated sedimentation caused by river erosion has led to rapid lake shrinkage. This phenomenon could be typical of the transformation of enclosed seas into lakes by the rapid uplifting movement of land in collision zones.

Highlights

The combination of rapid environmental changes induced by socioeconomic transformation and meteorological changes has a significant impact on local communities and their sustainability
The combination of rapid environmental changes induced by socioeconomic transformation and meteorological changes has significant impacts on local communities and their sustainability
More than 70% of lake sedimentation, resulting in shrinkage, is contributed by riverbank erosion caused by river drainage between 2003 and 2017

Summary

Introduction

The combination of rapid environmental changes induced by socioeconomic transformation and meteorological changes has a significant impact on local communities and their sustainability. These changes lead to environmental degradation, increased vulnerability to natural disasters, and the restructuring of rural livelihoods. The impact of environmental change together with human activities has been considered the most significant driving factor influencing the current rapid changes of lake systems [1,2,3,4,5,6] at a global scale. Environmental changes and human activities are diverse at the local level Local characteristics, such as the type of human activities and nature of the soil system, influence the rapid disappearance of lakes [1]

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