Hoang Su Phi is a mountainous district in Ha Giang province, Vietnam. When the rainy season arrives in these parts, flash floods (besides landslides), frequently occur in many areas, seriously affecting the socio‐economic condition of the district. Therefore, in this paper, we have developed an early warning system for flash floods, established based on a geomorphological and hydrological approach. The basic principle underlying this system is the fact that flash floods will often occur where there is high potential risk with sufficient rainfall. In the model, eight parameters of the basin were used to build a potential flash flood map. Using the spatial processing module in an open source software, early predictions from automatic weather stations were interpolated and processed online to produce a potential risk map. Depending on the threshold of precipitation values, the results determined locations where flash flood may occur at various flash flood risk indices (FFRI). The system may be applied to support provision of early flash flood warning up to 1−6 days in advance in the district, allowing the local government ample time to make appropriate decisions on the prevention and/or mitigation of damages caused by flash flood hazards.

中文翻译：

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在越南河江省Hoang Su Phi区建立山洪暴发预警系统

Hoang Su Phi是越南河江省的一个山区。当这些地区的雨季到来时，许多地区经常发生山洪（山体滑坡除外），严重影响了该地区的社会经济状况。因此，在本文中，我们开发了基于地貌和水文方法建立的山洪预警系统。该系统的基本原理是，在有足够降雨的高潜在风险的地方，经常会发生山洪泛滥。在该模型中，使用流域的八个参数来构建潜在的山洪暴发图。使用开源软件中的空间处理模块，可以对自动气象站的早期预测进行插值并在线进行处理，以生成潜在的风险图。根据降水量阈值，结果确定了在各种暴洪风险指数（FFRI）下可能发生暴洪的位置。该系统可用于支持在区域内提前1-6天提供早期山洪预警，从而使地方政府有足够的时间就预防和/或减轻山洪灾害造成的损害做出适当的决定。