Groundwater hydrodynamics of an Eastern Africa coastal aquifer, including La Niña 2016-17 drought.
Groundwater hydrodynamics of an Eastern Africa coastal aquifer, including La Niña 2016-17 drought.
复制标题
东非沿海含水层的地下水流体动力学，包括 2016-17 年拉尼娜干旱。
DOI：
10.1016/j.scitotenv.2019.01.198
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Ferrer N
中科院分区：
文献类型：
--
作者：
Ferrer N
2016-17年，东非大部分地区受到严重干旱的影响，这是由于印度洋偶极子和厄尔尼诺南方涛动的条件。像这样的极端事件对家庭、农业和工业用水的供应有直接和连锁的影响。地下水资源可在干旱时期提供缓冲，但其本身可能因补给减少和使用增加而受到压力，从而对地下水资源管理构成重大挑战。在东非，缺乏关于含水层特性的资料也妨碍了地下水管理。为了解决这一知识差距，这项研究显示了肯尼亚南部沿海拉尼娜2016/17干旱之前和期间的水文地质行为，该地下水系统位于代表东非海岸重要部分的地质结构内。开展了各种水化学和同位素活动以及地下水水头变化测量，以研究地下水的流体动力学，从而确定拉尼娜现象之前和期间气候条件下含水层系统的特征。利用当地数据集对2012年以来当地补给变化的估计对这一信息进行了补充。干旱的主要后果是与平均气候年相比，补给减少了69%。第一个雨季（4月至6月）的补给减少，第二个雨季（12月至12月）没有补给。即使在雨季，海水入侵也同时增加。
In 2016–17 much of East Africa was affected by a severe drought which has been attributed to Indian Ocean Dipole and El Niño Southern Oscillation conditions. Extreme events such as this have immediate and knock-on effects on water availability for household, agricultural and industrial use. Groundwater resources can provide a buffer in times of drought, but may themselves be stressed by reduced recharge and increased usage, posing significant challenges to groundwater resource management. In the context of East Africa, groundwater management is also hampered by a lack of information on aquifer characteristics. With the aim of addressing this knowledge gap, this study shows the hydrogeological behaviour before and during La Niña 2016/17 drought in southern coastal Kenya on a groundwater system which sits within a geological structure which is representative of an important portion of the East African coast. Diverse hydrochemical and isotopic campaigns, as well as groundwater head variation measurements, were carried out to study the groundwater hydrodynamics and thus characterize the aquifer system under climatic conditions before and during the La Niña event. This information is complemented with an estimation of changes in local recharge since 2012 using local data sets. The main consequence of the drought was a 69% reduction of recharge compared to an average climatic year. There was reduced recharge during the first rainy season (April–June) and no recharge during the second wet season (October–December). There was a concurrent increase in seawater intrusion even during the wet season.
登录
查看更多内容
非洲沿海地区含水层审查
影响因子：
2.8
作者：
G. Steyl;I. Dennis
通讯作者：
I. Dennis
坦桑尼亚东南部沿海流域深层承压含水层地下水停留时间和古充注条件
影响因子：
6.4
作者：
Said Suleiman Bakari;P. Aagaard;R. Vogt;F. Ruden;M. Brennwald;I. Johansen;S. Gulliksen
通讯作者：
S. Gulliksen
DOI：
10.5194/hess-2016-120
发表时间：
2016
期刊：
Hydrology and Earth System Sciences Discussions
影响因子：
--
作者：
I. Ouédraogo;M. Vanclooster
通讯作者：
M. Vanclooster
湿地与 Doñana 沿海含水层之间的关系（西班牙西南部）
影响因子：
2.8
作者：
M. Manzano;E. Custodio;E. Lozano;Horacio Higueras
通讯作者：
Horacio Higueras
南非东北部科西湾湖泊系统的水文地质特征
影响因子：
2.8
作者：
M. Ndlovu;M. Demlie
通讯作者：
M. Demlie