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首页> 外文期刊>Hydrology and Earth System Sciences >Flooding dynamics in a large low-gradient alluvial fan, the Okavango Delta, Botswana, from analysis and interpretation of a 30-year hydrometric record
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Flooding dynamics in a large low-gradient alluvial fan, the Okavango Delta, Botswana, from analysis and interpretation of a 30-year hydrometric record

机译：根据对30年水文记录的分析和解释，大型低梯度冲积扇，博茨瓦纳奥卡万戈三角洲的洪水动态

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摘要

The Okavango Delta is a flood-pulsed wetland, which supports a largetourism industry and the subsistence of the local population throughthe provision of ecosystem services. In order to obtain insight intothe influence of various environmental factors on flood propagationand distribution in this system, an analysis was undertaken of a30-year record of hydrometric data (discharges and water levels)from one of the Delta distributaries. The analysis revealed thatwater levels and discharges at any given channel site in thisdistributary are influenced by a complex interplay of flood wave andlocal rainfall inputs, modified by channel-floodplain interactions,in-channel sedimentation and technical interventions, both at thegiven site and upstream. Additionally, cyclical variation of channelvegetation due to intermittent nutrient loading, possibly sustainedby nutrient recycling, may play a role. It is shown that short andlong-term flood dynamics are mainly due to variation in floodplainflows. As a consequence, discharge data collected within the mainchannels of distributaries do not adequately represent floodingdynamics in the system. The paper contributes to the understandingof seasonal and long-term flood pulsing and their variation in lowgradient systems of channels and floodplains.
机译：奥卡万戈三角洲是一个充满洪水的湿地，通过提供生态系统服务来支持大型旅游业和当地居民的生存。为了了解该系统中各种环境因素对洪水传播和分布的影响，分析了一个三角洲分水岭的30年水文数据记录（流量和水位）。分析表明，该分布区中任何给定航道站点的水位和流量都受到洪水波和当地降雨输入的复杂相互作用的影响，并受到给定站点和上游的河道-洪泛区相互作用，河道内沉积和技术干预的影响。另外，由于间歇性养分负载，通道植被的周期性变化（可能由养分循环利用而持续）可能起作用。结果表明，短期和长期的洪水动态主要是由于洪泛区流量的变化。结果，在分流器主要渠道内收集的流量数据不能充分代表系统中的洪水动力学。本文有助于了解季节性和长期的洪水脉动及其在河道和洪泛区低梯度系统中的变化。

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