期刊
WATER
卷 12, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/w12082243
关键词
Lake Tana; bathymetry; morphometry; phosphorus; water hyacinth; tropical lake
资金
- EXCEED-SWINDON project Excellence Center for Development Cooperation-SustainableWater Management in developing countries, centered in the Technical University of Braunschweig, Germany
- Blue Nile Water Institute of Bahir Dar University Ethiopia
- Robert S. McNamara Fellowships Program of the World Bank
Lakes hold most of the world's fresh surface water resources. Safeguarding these resources from water quality degradation requires knowledge of the relationship between lake morphometry and water quality. The 3046-km(2)Lake Tana in Ethiopia is one of the water resources in which the water quality is decreasing and water hyacinths have invaded. The objective of this study is to understand the interaction between the lake morphometry and water quality and specifically the phosphorus dynamics and their effect on the water hyacinths. A bathymetric survey was conducted in late 2017. Various morphometric parameters were derived, and both these parameters and sediment available phosphorus were regressed with the dissolved phosphorus. The results show that, with a wave base depth that is nearly equal to a maximum depth of 14.8 m, the bottom sediments were continuously suspended in the water column. As a result of the resuspension mixing, we found that the dissolved phosphorus in the water column decreased with lake depth and increased with sediment available phosphorus (R-2= 0.84) in the northern half of the lake. This relationship is not as strong in the south due to a large flow of Gilgel Abay to the outlets. Water hyacinths were found where the lake was shallow and the available phosphorus was elevated. The large reservoir of sediment phosphorus will hamper any remedial efforts in removing the water hyacinths.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据