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首页> 外文会议>International Union of Geodesy and Geophysics General Assembly >Climate, runoff and landuse trends in the Owo River Catchment in Nigeria
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Climate, runoff and landuse trends in the Owo River Catchment in Nigeria

机译：尼日利亚欧及亚河流域的气候，径流和土地利用趋势

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The Owo River is an important surface water source in Lagos particularly to the western section. It is the source of direct water intake for water supply by Lagos State Water Corporation to Amuwo-Odofin, Ojo and parts of Badagry Local Government Areas. This paper examines the complex interactions and feedbacks between many variables and processes within that catchment and analyses the future ability of this semi-urban watershed in sustaining water supply in the face of cumulative environmental change. Stationarity analysis on rainfall, change detection analysis and morphometry analysis were combined to analyse the non-stationarity of Owo River catchment. On rainfall trend analysis, since the correlation coefficient (0.38) with test statistic of 2.17 did not satisfy the test condition we concluded that there is trend and that rainfall in the watershed is not stationary. The dominant land use impacting on the bio-geochemical fluxes is built up area (including structures and paved surfaces) which grew from about 142.92km~2 (12.20%) in 1984 to 367.22km~2 (31.36%) in 2013 recording gain of 224.3 km~2 at average growth rate of 7.73 km~2 per annum. Total length of streams within the catchment reduced from 622.24km in 1964 to 556km in 2010, while stream density reduced from 0.53 in 1964 to 0.47 in 2010 an indication of shrinking hydrological network. The observed trends in both natural and anthropogenic processes indicated non-stationarity of the hydrological fluxes within the Catchment and if this continues, the urban ecosystem services of water supply will be compromised.
机译：owo河是拉各斯的重要地表水源，特别是西部。 Lagos State Water Corporation源于水供应的直接进水的源泉，以Amuwo-Odofin，OJO和Badagry地方政府地区的部分地区。本文研究了该集水区内许多变量和流程之间的复杂相互作用和反馈，并分析了这一半城市流域的未来能力，面对累计环境变化的持续供水。平降水，改变检测分析和形态测量分析的平稳分析分析了欧沃河流域的非公平性。在降雨趋势分析中，由于与2.17的试验统计学的相关系数（0.38）并不满足测试条件，我们得出的结论是，流域的降雨并不静静。对生物地球化学通量的主导土地利用建筑面积（​​包括结构和铺砌的表面），在1984年的约142.92km〜2（12.20％），2013年的367.22km〜2（31.36％）录制增益平均增长率为224.3 km〜2，每年平均增长率为7.73 km〜2。集水区内的溪流总长度从1964年的622.24km减少到2010年的556公里，而流密度从1964年的0.53减少到2010年的0.47，表明水文网络收缩的指示。天然和人为过程的观察到趋势表明了集水区内的水文势态的非公平性，如果这一持续存在，供水的城市生态系统服务将受到损害。

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