Exotic Plantations Increase Risks of Flooding in Mountainous Landscapes

Exotic Plantations Increase Risks of Flooding in Mountainous Landscapes
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外来种植园增加了山区洪水的风险

DOI:
10.1002/essoar.10503675.1
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发表时间:
2020
期刊:
--
影响因子:
--
通讯作者:
Nayak R
Nayak R
中科院分区:
--
文献类型:
--
作者:
Nayak R

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研究了极端降雨条件下丘陵集水区土地覆盖对流量的影响。在2014年1月至2016年12月期间,研究人员收集了11个邻近集水区三年的降雨径流观测数据。每个集水区以不同的土地覆盖为主,即天然浅滩林、天然草地和金合欢(金合欢)。降雨强度在25-90、90-95和超过95分位数之间被划分为轻、重和极端,并用于研究河流流量响应。土地覆盖对极端降雨事件的水文响应有显著影响。在小雨期(< 38 mm/d),以草地为主的集水区的径流量高于萧拉(0.01 mm/s)和金合欢(0.004 mm/s)。然而,在极端降雨事件(bbb71 mm/d)中,以金合欢树为主的流域的径流量显著高于自然流域(0.033 mm/s)和草地流域(0.023 mm/s)。先前的湿度条件与降雨量、集水区形状和排水密度一起在决定峰值流量方面发挥了主要作用。
We examined the effect of land cover on stream discharge in hilly catchment streams during extreme rain events. Three years of rainfall-runoff observations, between January 2014 and December 2016, were collected in eleven neighbouring catchments. Each catchment was dominated by a different land cover, namely natural shola forests, natural grasslands and wattle (Acacia mearnsii). Rain intensities between percentiles 25-90, 90-95 and over 95 were categorised as light, heavy and extreme and were used to study stream discharge responses. Land cover significantly influenced the hydrologic response to extreme rain events. During light rains (< 38 mm/day), grassland dominated catchments showed higher discharge than shola (0.01 mm/s) and wattle (0.004 mm/s). However, during extreme rain events (> 71 mm/day) discharge was significantly higher in wattle dominated catchments when compared to the natural shola (0.033 mm/s) and grasslands (0.023 mm/s). Antecedent moisture conditions played a major role in determining peak flows along with rainfall, catchment shape and drainage density.
埃塞俄比亚高地季风气候的降雨与流量关系
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