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首页> 外文会议>International Union of Geodesy and Geophysics General Assembly >Sedimentary evolution and ecosystem change in Ahémé lake, south-west Benin
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Sedimentary evolution and ecosystem change in Ahémé lake, south-west Benin

机译：贝宁安斯湖Ahémé湖沉积演化与生态系统变化

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摘要

Tropical moist ecosystems, such as Ahémé lake, south-west Benin, are increasingly marked by water degradation, linked with the activities of increasing riparian populations. The objective of this study is to analyze sedimentary dynamics and its influence on the changing ecosystem of Ahémé lake from 1961-2010. Data used to carry out the study are records of precipitation, flows, turbidity, suspended sediment, mineral elements and bathymetry. Grain size data from the sieving of sediment samples were used to interpret suspended solids distribution in the lake. Linear correlation coefficients were used to assess the degree of dependence between rainfall and runoff inputs to the lake. Lake depth measurements in some areas of the lake serve to determine the rate of infilling. The sorting index was used to highlight the distribution and origin of sediments in the lake. The results show a degradation of the lake Ahémé ecosystem characterized by infilling of its bed, a high correlation (r= 0.90) between rainfall and runoff, seasonal change in physicochemical parameters (total suspended sediment decrease by --91 %) and decrease in fish production by 135.8tyr~(-1). The highest mean suspended sediment concentrations in lake inputs occur during high water periods (123 mgL~(-1)) compared to low water periods (11.2 mgL-~1).
机译：热带潮湿的生态系统，如Ahémé湖南贝宁，越来越多地被水退化标志着，与河岸人口增加的活动有关。本研究的目的是分析1961 - 2010年从1961 - 2010年改变Ahémé湖生态系统的沉积动态及其影响。用于执行该研究的数据是沉淀，流动，浊度，悬浮沉积物，矿物元素和碱度曲目的记录。来自沉积物样品的筛分中的粒度数据用于解释湖泊中的悬浮固体分布。线性相关系数用于评估降雨和径流输入到湖泊之间的依赖程度。湖区某些地区的湖泊深度测量有用于确定infilling的速度。分拣指数用于突出湖中沉积物的分布和起源。结果表明，通过灌输床，降雨和径流之间的高相关（R = 0.90），物理化学参数（总悬浮沉积物减少 - 91％）和鱼类减少的季节性变化生产135.8tyr〜（-1）。与低水期相比，在高水位（123mg〜（-1））期间发生最高平均悬浮沉积物浓度（123mgl〜（-1））（11.2mgl-〜1）。

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