Spatiotemporal variation characteristics of water cycle elements in the Nansihu Basin
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Abstract:
ln this study,eight monitoring stations were selected to analyze the spatial and temporal characteristics of water cycle elements, such as precipitation,runoff,and evaporation in the basin. For this purpose,measured hydrological data from 1952 to 2015, the Mann-Kendall nonparametric test and Morlet wavelet transform were used. The results indicated that precipitation showed an increasing trend, and the runoff and evaporation showed a decreasing trend in the basin. The interannual variation cycle of each water cycle element had multiple time scales nested with each other. The main cycle of precipitation and evaporation was 25a, and runoff was 3la,respectively. The distribution of water cycle elements was uneven during the year, while the precipitation was concentrated in June-August. The peak value of runoff was one month behind the precipitation, and the maximum value of evaporation appeared in June. The spatial distribution was uneven, which characterized by the decreasing trend of precipitation from southeast to northwest. The spatial distribution pattern of runoff depth was consistent with precipitation. The change of water cycle elements in Hudong area was greater than that in Huxi area. The temporal and spatial variation characteristics of the water cycle elements of the basin may be affected by climate change and human activities.