Effects of river regulation on aquatic macrophyte growth and floods in the Hadejia‐Nguru Wetlands and flow in the Yobe River, northern Nigeria; implications for future water management
Effects of river regulation on aquatic macrophyte growth and floods in the Hadejia‐Nguru Wetlands and flow in the Yobe River, northern Nigeria; implications for future water management
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河流调节对哈德贾-恩古鲁湿地水生植物生长和洪水的影响以及尼日利亚北部约贝河流量对未来水管理的影响；
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发表时间：
2002
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B. Goes
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作者：
B. Goes
哈德加河是尼日利亚北部半干旱地区约贝河的一条支流，由两座大坝调节。另一条主要支流不受控制。对比治理和非治理河流流量数据，哈德甲河上游年流量平均减少33%。然而，哈德加河下游、哈德加-努古鲁湿地 (HNW) 上方的年总流量和峰值流量并未显示流量显着减少。这与哈德甲河上游低流量时河水流量减少幅度较小以及上游正式用水大户尚未满负荷运转有关。大坝对河流下游的主要影响是从短暂到永久的政权变化。引入的旱季水流为高西北地区水生植物堵塞的发展创造了有利的环境。由于这些堵塞，哈德加河在一年中的大部分时间里停止了对约贝河的流量。此外，大坝建成后，高西北地区洪水发生的时间变得更加难以预测。
The Hadejia River is a tributary of the Yobe River in semi‐arid northern Nigeria and is regulated by two major dams. The other main tributary is uncontrolled. Comparison of the discharge data for the controlled and uncontrolled rivers shows an average decrease of 33% in annual flow in the upstream part of the Hadejia River. The total annual flow and the peak flow in the Hadejia River further downstream, just above the Hadejia‐Nguru Wetlands (HNW), however, did not show a significant reduction in discharge. This is related to a relatively small river flow reduction at lower flows in the upstream part of the Hadejia River and the fact that the formal large upstream water users are not (yet) working at full capacity. The major impact of the dams on the downstream part of the river is the change in regime from ephemeral to perennial. The introduced dry season flows created favourable circumstances for the development of aquatic macrophyte blockages in the HNW. Owing to these blockages, the Hadejia River stopped contributing to the flow in the Yobe River for much of the year. Furthermore, after the completion of the dams, the timing of the floods in the HNW became less predictable.