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河流水沙变化同时受到气候变化和人类活动的影响,在相同的气候条件下,水沙变化的影响主要是人类活动引起的。采用1961-2010年唐乃亥水文站以上河源区的气象数据,通过反距离加权平均法对潜在蒸发量和降雨量进行空间插值,选择气候相似年组,计算了组内唐乃亥站的年径流量和年输沙量的变化,并结合土地利用和NDVI变化分析了原因。结果表明:研究区共有12个相似年组,在时间上涉及到研究时段的所有年代和降雨量特征;分别有11组和9组的年径流量和年输沙量减小,反映出河流水沙整体减少的整体特征;不同相似年组人类活动对河流水沙的影响幅度差异较大。该方法可以明确判定人类活动的影响程度,并显示出人类活动对水沙影响的复杂性,可以帮助我们区分气候变化和人类活动的不同影响。
Changes in water and sediment in rivers are also affected by climate change and human activities. Under the same climate conditions, the impact of water and sediment changes is mainly caused by human activities. Based on the meteorological data of the Heyuan area above Tangnaihai Hydrological Station from 1961 to 2010, the potential evapotranspiration and rainfall were interpolated by inverse distance weighted average method. The climatic similarity year group was selected to calculate the annual runoff and year The change of sediment discharge and the reason of the change of land use and NDVI. The results show that there are altogether 12 similar year groups in the study area, covering all the age and rainfall characteristics of the study period in time. The annual runoff and annual sediment discharge of 11 and 9 groups decrease respectively, reflecting that river water The whole characteristics of the overall reduction of sand are different. The influence of human activities on the water and sediment of the river in different similar years is quite different. The method can clearly determine the impact of human activities and show the complexity of the impacts of human activities on water and sediment, which can help us to distinguish the different impacts of climate change and human activities.