The Influence of Surface Water and Groundater on Wetland Conditions in the Typical Suspended River Reach of the Lower Yellow River
This study compared and analyzed the characteristics of the Yellow River runoff and channel changes,as well as the changes in groundwater flow field during different periods.The impact of groundwater and surface water on wetland changes along the Yellow River were analyzed,combined with remote sensing interpretation methods.The results show that:(1)the areas of artifi-cial wetlands increase significantly,while natural wetlands are still showing a shrinking trend.The fragmentation of mudflat wet-land is increasing,and the stability of ecological environment is poor.(2)The flow and water level of the surface water show a decreasing trend by year,and the wandering swing of the river is obvious,which directly affects the area and stability of the river mudflat wetland.(3)The shallow groundwater level in the research area has experienced a maximum decrease of 5 m in the past decade and a maximum decrease of 9 m in the past twenty years.Due to the continuous decline of groundwater level,the wetland area outside the north dike of the Yellow River decreased.Due to the diversion of Yellow River water and the lateral in-filtration of receding water,a new back river depression has been formed outside the south dike,with an increasing trend in wet-land area and relatively good ecological environment stability.The connectivity between surface water and groundwater is good,and a lower groundwater table will weaken the role of river runoff,which is unfavorable for the overall development of wetlands along the Yellow River.(4)Reducing the exploitation of groundwater and ensuring sufficient water diversion from the Yellow River is beneficial for the development of wetlands in the lower reaches outside the dike.
the Yellow Riversuspended riverthe interactions between surface water and groundwaterwetlandsgroundwater flow fieldremote sensing
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