Long-term changes in riparian forest cover under a dam-induced flow scheme: the accompanying a numerical modelling perspective

IF 4.6 Q2 ENVIRONMENTAL SCIENCES
Bhagya Nallaperuma, T. Asaeda
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引用次数: 11

Abstract

Abstract River regulation affects downstream riparian vegetation dynamics. This paper investigates changes in vegetation cover along a steep reach of the Kitakami river in Japan, below the Gosho dam. Historical aerial imagery covering 60-years of both the pre- and post- dam construction phases is used to document land cover evolution. Changes in riparian forest cover are evaluated in relation to the corresponding hydrological regimes. A long-term trend in forest cover encroachment was revealed and a temporal correlation analysis confirmed a clear association with the modified water and sediment regime downstream of the dam. In addition, a numerical simulation of changes in spatial tree distribution using the dynamic riparian vegetation model (DRIPVEM) was undertaken. Validation of the simulation using the Kappa statistic showed a moderate-to-substantial agreement between model output and the photographic record.
水坝诱导水流方案下河岸森林覆盖的长期变化:伴随的数值模拟视角
河流调节影响下游河岸植被动态。本文调查了日本北上河(Kitakami river)陡峭河段的植被覆盖变化,该河段位于Gosho大坝下方。历史航空图像涵盖60年的前后大坝建设阶段被用来记录土地覆盖的演变。河岸森林覆盖的变化是根据相应的水文制度来评估的。森林覆盖侵蚀具有长期趋势,时间相关分析证实了森林覆盖侵蚀与大坝下游水沙状况的改变有明显的联系。此外,利用动态河岸植被模型(DRIPVEM)进行了树木空间分布变化的数值模拟。利用Kappa统计验证的模拟表明,模型输出和摄影记录之间有中等到实质性的一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
7.10
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