基于Mann-Kendall法的流域降雨与地下水位时空变化特征研究

Temporal and spatial variations of rainfall and groundwater level in a watershed based on Mann-Kendall method

降水量在空间和时间上的变化会影响水资源的可用性,导致农业、生态和基础设施受损。在区域和局部尺度上,降雨均有增加和减少的趋势。降雨强度增加可能导致山洪暴发,降水减少也会影响水的可用性和水质。如何预测降水量在时空中的变化趋势具有重要意义。采用Mann-Kendall方法对河北某区域降雨量变化趋势及特征进行分析,并分析观测井的降雨量与地下水水位之间的关系,研究成果可知:4个观测台站中,H台站接收的年降雨量最大,最大值达到了5 153 mm,而K-K台站最大降雨量仅次于H站台,为3 598 mm。地下水位变化与降雨变化趋势相同。可为相关工程提供参考。

Spatial and temporal variations in precipitation can affect the availability of water resources,leading to damage to agriculture,ecology and infrastructure.There is a tendency for rainfall to increase and decrease at both regional and local scales.Increased rainfall intensity can lead to flash floods,and reduced precipitation can also affect water availability and quality.How to predict trends in precipitation over time and space is of great importance.The Mann-Kendall method was used to analyse the trends and characteristics of rainfall in a region in Hebei and to analyse the relationship between rainfall and groundwater levels in observation wells,and the research results show that:Of the four stations,station H received the largest annual rainfall with a maximum of 5153 mm,while station K-K received the second largest rainfall after station H with 3598 mm.Groundwater level changes follow the same trend as rainfall changes.It can be used as a reference for related works.