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首页> 外文期刊>Lakes & Reservoirs >Stratification, diel and seasonal energy transfers in Malilangwe Reservoir in the south-eastern lowveld of Zimbabwe
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Stratification, diel and seasonal energy transfers in Malilangwe Reservoir in the south-eastern lowveld of Zimbabwe

机译：津巴布韦东南部低洼地区马里朗格水库的分层，diel和季节性能量转移

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This study provides a 9-month record of Malilangwe Reservoir stratification and diel and seasonal energy transfers between February and October 2011. The reservoir was not strongly stratified during the hot-wet season (February and March), exhibiting low dissolved oxygen concentrations of ＜2 mg DO L~(-1) in the bottom layers (＜6 m depth). During the cool-dry season, when both the air temperature and solar radiation input decreased, the water temperatures in the epilim-nion and across the thermocline decreased, and the water column was very weakly stratified. In this state, the reservoir could easily be mixed, even by light winds, resulting in overturning, thereby giving the bottom water an opportunity to become aerated, as observed during the cool-dry season. The stability was greatest when the water level was high (during midday), while it was considerably lower during the predawn hours. The calculated annual Birgean heat budget for the reservoir was 110 MJ m~(-2) year~(-1) for February to October 2011. The diurnal Birgean heat budget was consistently associated with heat loss over a 24 hour period in all seasons, mostly between 0400 and 1000 h. Spearman's correlation suggests that the DO was significantly correlated with stability for the three study months (February r = 0.69, P ＜ 0.05; June r = -0.76, P ＜ 0.001; October r = 0.96, P ＜ 0.001). The results of this study suggests that warming temperatures (warmer months or seasons) will result in high Birgean heat budgets, which could potentially trigger some important changes in plankton population dynamics in small reservoir, with severe water quality implications. The nutrient concentrations varied throughout the seasons.
机译：这项研究提供了9个月的记录，记录了2011年2月至2011年10月之间马里朗格水库的分层以及diel和季节性能量转移。在热湿季节（2月和3月），该储层没有强烈地分层，其溶解氧浓度＜2 mg DO L〜（-1）位于底层（＜6 m深度）。在冷干季节，当空气温度和太阳辐射输入均降低时，上层和温跃层中的水温均降低，水柱非常弱地分层。在这种状态下，即使在微风的作用下，水库也很容易混合，导致倾覆，从而使底水有机会充气，如在凉爽干燥季节所观察到的那样。当水位高（中午时）时，稳定性最大，而在黎明前小时则低得多。计算得出的该水库在2011年2月至10月的年度Birgean热预算为110 MJ m〜（-2）年〜（-1）。在所有季节中，昼夜Birgean热预算始终与24小时内的热量损失相关，通常在0400到1000小时之间。 Spearman的相关性表明，溶解氧与三个研究月的稳定性显着相关（2月r = 0.69，P ＜0.05； 6月r = -0.76，P ＜0.001； 10月r = 0.96，P ＜0.001）。这项研究的结果表明，变暖的温度（较温暖的月份或季节）将导致伯尔热热量预算过高，这有可能引发小型水库浮游生物种群动态的一些重要变化，从而严重影响水质。在整个季节中，营养成分的浓度都不同。

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