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Monitoring of riparian vegetation response to flood disturbances using terrestrial photography

机译：利用陆地摄影监测河岸植被对洪水干扰的响应

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Flood disturbance is one of the major factors impacting riparian vegetationon river floodplains. In this study we use a high-resolution ground-basedcamera system with near-infrared sensitivity to quantify the immediateresponse of riparian vegetation in an Alpine, gravel bed, braided river toflood disturbance with the use of vegetation indices. Five large floods withreturn periods between 1.4 and 20.1 years in the period 2008–2011 in theMaggia River were analysed to evaluate patterns of vegetation response inthree distinct floodplain units (main bar, secondary bar, transitional zone)and to compare the sensitivity of seven broadband vegetation indices. Theresults show both a negative (damage) and positive (enhancement) response ofvegetation within 1 week following the floods, with a selective impactdetermined by pre-flood vegetation vigour, geomorphological setting andintensity of the flood forcing. The spatial distribution of vegetation damageprovides a coherent picture of floodplain response in the three floodplainunits. The vegetation indices tested in a riverine environment with highlyvariable surface wetness, high gravel reflectance, and extensivewater–soil–vegetation contact zones differ in the direction of predictedchange and its spatial distribution in the range 0.7–35.8%. We concludethat vegetation response to flood disturbance may be effectively monitored byterrestrial photography with near-infrared sensitivity, with potential forlong-term assessment in river management and restoration projects.
机译：洪水扰动是影响河滩区河岸植被的主要因素之一。在这项研究中，我们使用具有近红外灵敏度的高分辨率地面照相机系统，通过使用植被指数来量化在高寒，砾石层，辫状河洪水泛滥扰动中的河岸植被的即时响应。分析了玛吉亚河在2008-2011年期间发生的五次大洪水，回潮期在1.4到20.1年之间，以评估三个不同洪泛区单元（主坝，次生坝，过渡带）的植被响应模式，并比较了七个宽带植被的敏感性索引。结果表明，洪灾后1周内，植被的负响应（破坏）和正响应（增强），选择性影响取决于洪水前的植被活力，地貌环境和洪水强迫强度。植被破坏的空间分布提供了三个洪泛区单元中洪泛区响应的连贯图片。在具有高度变化的地表湿度，高砾石反射率和广泛的水-土-植被接触区的河流环境中测试的植被指数在预测变化的方向及其空间分布范围在0.7-35.8％之间。我们的结论是，可以通过具有近红外敏感性的地面摄影技术来有效监测植被对洪水干扰的响应，并可能在河流管理和修复项目中进行长期评估。

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