水系连通工程下博斯腾湖矿化度时空变化及其驱动因素研究

分析了开都河－黄水沟－大湖区－小湖区连通工程实施后博斯腾湖矿化度的时空变化及其驱动因素，以期为进一步改善博斯腾湖水环境提供科学指导。结果表明：空间变化上，水系连通工程促进了博斯腾湖大、小湖区水循环，改善了博斯腾湖矿化度，使黄水沟河道（南大闸）矿化度降低了0.5~1.0 g/L、大湖区西北角和东南部矿化度降低了0.3~0.5 g/L、小湖区东部矿化度降低了0~1.5 g/L；时间变化上，博斯腾湖黄水沟区、西岸区、大湖区和小湖区矿化度变化具有较高的同步性；水系连通工程的实施对改善博斯腾湖矿化度空间分布作用显著；高矿化度水体的扩散和湖水水位，尤其是水温等因素共同驱动了矿化度随时间的变化。在水系连通工程实施下，科学调控年内入湖、出湖水量并严格阻止污水入河、入湖是改善博斯腾湖矿化度的关键。

Spatial-temporal variation of TDS in Bosten Lake and its driving factors under water system connectivity engineering

The spatial-temporal variation of total dissolved solids (TDS) in Bosten Lake and it''s driving factors after the implementation of the Kaiduhe River-the Huangshuigou River-the Great Lake-the Small Lake connectivity project were analyzed in order to provide practical guidance for the improvement of water environment in Bosten Lake. The results show that in terms of spatial variation, the connectivity project of the Bosten Lake water system promoted the water circulation in the Great Lake and the Small Lake area, alleviated the TDS in Bosten Lake with the decrease of 0.5-1.0 g/L TDS in the Huangshuigou River (Nanda Sluice), 0.3-0.5 g/L in the northwestern and southeastern part of the Great Lake, and 0-1.5 g/L in the eastern part of the Small Lake. In terms of time variation, the changes of TDS content in the Huangshuigou area, the west Coast area, the Great Lake and the Small Lake of Bosten Lake were highly synchronized. The implementation of the water system connectivity project had a significant effect on improving the spatial distribution of TDS in Bosten Lake. The diffusion of water with higher TDS, water level, especially water temperature all contributed to the temporal changes of TDS. With the implementation of the water system connectivity project, it is crucial to regulate the inflow and outflow of the lake reasonably in a year, and strictly prevent sewage from entering the rivers and lakes.