Reconciling Environmental and Flood Control Goals on an Arid-Zone River: Case Study of the Limitrophe Region of the Lower Colorado River in the United States and Mexico
Reconciling Environmental and Flood Control Goals on an Arid-Zone River: Case Study of the Limitrophe Region of the Lower Colorado River in the United States and Mexico
复制标题
协调干旱地区河流的环境和防洪目标：美国和墨西哥科罗拉多河下游极限绳地区的案例研究
DOI：
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发表时间：
2008
影响因子：
3.5
通讯作者：
J. Pitt
中科院分区：
文献类型：
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作者：
E. Glenn;Kate Hucklebridge;Osvel Hinojosa‐Huerta;P. Nagler;J. Pitt
干旱地区河流的流速变化很大，需要防洪工程来保护邻近的财产免受洪水的破坏。另一方面，河岸走廊提供了重要的野生动物栖息地，特别是鸟类，河岸植被适应这些河流流量的自然变化。虽然环境和防洪目标可能会出现不一致，我们表明，这两个目标可以容纳在利米特罗夫地区（美国和墨西哥之间的共同边界）的下科罗拉多河。1999年，国际边界和水委员会提出了一个例行维护项目，以清除利米特罗夫地区的植被，并在该地区建立一条试验性河道，以提高水流能力并划定边界。然而，2000年通过了国际水条约第306号会议记录，其中要求考虑国际边界和水委员会行动的环境影响。我们在利米特罗夫河进行了植被和鸟类调查，发现这段河流与流量调节的河流相比，具有异常丰富的原生棉白杨和杨柳、沼泽栖息地以及居民和候鸟。洪水频率分析表明，现有的堤防系统可以很容易地包含100年一遇的洪水，即使植被不被删除，现有的辫状河道系统具有更大的承载能力比拟议的先导通道。
Arid zone rivers have highly variable flow rates, and flood control projects are needed to protect adjacent property from flood damage. On the other hand, riparian corridors provide important wildlife habitat, especially for birds, and riparian vegetation is adapted to the natural variability in flows on these rivers. While environmental and flood control goals might appear to be at odds, we show that both goals can be accommodated in the Limitrophe Region (the shared border between the United States and Mexico) on the Lower Colorado River. In 1999, the International Boundary and Water Commission proposed a routine maintenance project to clear vegetation and create a pilot channel within the Limitrophe Region to improve flow capacity and delineate the border. In 2000, however, Minute 306 to the international water treaty was adopted, which calls for consideration of environmental effects of IBWC actions. We conducted vegetation and bird surveys within the Limitrophe and found that this river segment is unusually rich in native cottonwood and willow trees, marsh habitat, and resident and migratory birds compared to flow-regulated segments of river. A flood-frequency analysis showed that the existing levee system can easily contain a 100 year flood even if vegetation is not removed, and the existing braided channel system has greater carrying capacity than the proposed pilot channel.