The challenges and implications of assessing groundwater recharge: A case study – northern Sandveld, Western Cape,South Africa
The challenges and implications of assessing groundwater recharge: A case study – northern Sandveld, Western Cape,South Africa
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评估地下水补给的挑战和影响：案例研究 - 南非西开普省桑德维尔德北部
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. Wentzel
中科院分区：
文献类型：
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作者：
J. Conrad;J. Nel;J. Wentzel
水务和林业部目前正在进行详细的水文地质研究。
南非西开普省桑德维尔德北部地区。此外，还开展了由DWAF资助的初步研究。
在该地区评估水文、生态和植物成分。这一地区正受到人们的极大关注
环境的独特性(该地区的一部分是拉姆萨尔遗址)及其重要的地下水资源，这些资源正在得到利用
用于农业和市政供水。在某些地区，地下水的抽取正在对地表水造成影响
水流、地下水和相关的生态系统。
为了了解这些系统及其在区域内的相互关系，有必要进行水
余额计算。在进行这种计算时，“输入”分量的量化和相关的时间和
解决空间变异性问题很重要。由于特别重视地下水的补给，该地区可能会直接接收这两个
地下水补给，(作为降水的结果)，和遥远的地下水流入，通过横跨
这一地区可能从内陆补给区(即塞德堡山脉)输入地下水。
早些时候在该地区和地质相似的环境中进行的地下水补给研究表明，补给的范围很广。
价值观。特别是初级含水层，早期保守的补给值表明补给量为8%，最高可达15%。目前的研究表明，直接充电值在0.2%至3.4%之间。评估
水量平衡计算表明，这些补给量更符合实际。地下水补给的量化对于资源导向措施具有重大意义，这些措施也正在该地区实施，符合1998年南非《国家水法》的要求。以资源为导向的措施旨在确保水资源的利用和发展与保护措施相平衡，从而保证资源的可持续利用。《水务评论》第30卷(5)2005年：第75-81页
The Department of Water Affairs and Forestry (DWAF) is currently carrying out detailed hydrogeological studies within the
northern Sandveld area, Western Cape, South Africa. In addition, preliminary studies funded by DWAF, have also been carried
out in the area assessing hydrological, ecological and botanical components. The area is receiving much attention due to its
environmental uniqueness (part of the area is a Ramsar site) and its significant groundwater resources, which are being utilised
for agricultural purposes and municipal water supply. In certain areas this groundwater abstraction is impacting on surface water
flows, groundwater and associated ecosystems.
In order to gain an understanding of the systems and their inter-relationships within the area, it is necessary to carry out water
balance calculations. In carrying out such calculations, the quantification of the “input” component and associated temporal and
spatial variability is important to address. With special emphasis on groundwater recharge, the area may be receiving both direct
groundwater recharge, (as a consequence of precipitation), and distant groundwater inflow, via the large faults that transect the
area, which may be importing groundwater from the inland recharge areas (i.e. the Cederberg Mountains).
Earlier groundwater recharge studies within the area and in geologically similar settings indicate a wide range in recharge
values. With special reference to the primary aquifers, earlier conservative recharge values indicate 8% recharge, with values as high as 15% being obtained. The current study indicates direct recharge values in the region of 0.2 to 3.4%. Assessment
of water balance calculations indicate these recharge values are more realistic. The groundwater recharge quantification has huge significance for the Resource Directed Measures that are also being carried out in the area, in line with the requirements of the South African National Water Act of 1998. The Resource Directed Measures are aimed at ensuring water resource use and development is balanced by protection measures thereby guaranteeing the sustainable use of the resource. Water SA Vol. 30 (5) 2005: pp.75-81