Characteristics of rain events at an inland locality in northeastern Borneo, Malaysia
Characteristics of rain events at an inland locality in northeastern Borneo, Malaysia
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DOI：
10.1002/hyp.6160
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发表时间：
2006-11-30
影响因子：
3.2
通讯作者：
Chappell, Nick A.
中科院分区：
文献类型：
--
作者：
Bidin, Kawi;Chappell, Nick A.
了解热带降雨事件的强度和持续时间，对于模拟湿冠层蒸发的速率和时间、蒸腾的抑制、过量渗透的产生以及由此产生的侵蚀和河流响应性至关重要。尽管有这一核心作用，但很少有研究涉及赤道风暴的特征。本研究分析了婆罗洲东北部内陆5公里(2)区域的降雨数据，主要包括4公里(2)Sapat Kalisun实验集水区，采样频率从1分钟（-1）到1天（-1）。这项工作清楚地表明，这个内陆森林地区的大部分降雨是在定期的短时间事件（< 15分钟）中获得的，这些事件的强度相对较低（即在几乎所有5分钟期间少于两个0.2毫米雨量计的提示）。降雨似乎是局地性的，在典型的午后对流事件中，几分钟内可观察到尺度间相关性的显著损失。这表明，需要一个密集的雨量计网络，以高时间频率采样，以便对这些小集水区进行准确的分布式降雨径流建模。观测到的降雨事件强度远小于测量到的入渗能力，因此支持了快速地下响应在控制这个小赤道流域河流行为方面占主导地位的原则。版权所有(c) 2006约翰威利父子有限公司
Understanding the intensity and duration of tropical rain events is critical to modelling the rate and timing of wet-canopy evaporation, the suppression of transpiration, the generation of infiltration-excess overland flow and hence to erosion, and to river responsiveness. Despite this central role, few studies have addressed the characteristics of equatorial rainstorms. This study analyses rainfall data for a 5 km(2) region largely comprising of the 4 km(2) Sapat Kalisun Experimental Catchment in the interior of northeastern Borneo at sampling frequencies from 1 min(-1) to 1 day(-1).The work clearly shows that most rainfall within this inland, forested area is received during regular short-duration events (< 15 min) that have a relatively low intensity (i.e. less than two 0.2 mm rain-gauge tips in almost all 5 min periods). The rainfall appears localized, with significant losses in intergauge correlations being observable in minutes in the case of the typical mid-afternoon, convective events. This suggests that a dense rain-gauge network, sampled at a high temporal frequency, is required for accurate distributed rainfall-runoff modelling of such small catchments. Observed rain-event intensity is much less than the measured infiltration capacities, and thus supports the tenet of the dominance of quick subsurface responses in controlling river behaviour in this small equatorial catchment. Copyright (c) 2006 John Wiley & Sons, Ltd.