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A seasonal 222Rn mass-balance of Lake Burullus, Egypt: Indications for higher pore water exchange rates during the dry season
Journal of Environmental Radioactivity ( IF 2.3 ) Pub Date : 2020-10-17 , DOI: 10.1016/j.jenvrad.2020.106368
Noha Imam , Nils Moosdorf , Till Oehler , Afaf Nada

Radon mass balances in lakes can be used to trace transport processes along the sediment-water interface, such as groundwater discharge or pore water exchange. Understanding these transport processes is important, as they can affect the lake water budget, or biogeochemical cycles in lakes due to nutrient inputs. We present here a seasonal 222Rn mass balance of Lake Burullus (Northern Egypt), the second largest lake of Egypt. The Lake receives 222Rn from drainage water and the decay of 226Ra, and loses 222Rn via decay of 222Rn, atmospheric evasion and water discharge into the Mediterranean Sea. However, the mass balance reveals a significant surplus of 222Rn, which cannot be explained by the previously mentioned processes. The 222Rn surplus is especially high during the dry season, and might be explained by groundwater discharge and pore water exchange which transports 222Rn into the lake. Higher 222Rn fluxes into the lake during dry season might be explained by higher bioirrigation rates due to warmer temperatures, or higher groundwater discharge rates due to a higher hydraulic head on land caused by excessive irrigation in adjacent fields. Groundwater discharge and pore water exchange should be investigated in further detail in order to understand if they have effects on water budgets and biogeochemical cycles of Lake Burullus.



中文翻译:

埃及Burullus湖的季节性222 Rn质量平衡:干旱季节毛孔水交换率更高的迹象

湖泊中的质量平衡可用于追踪沿沉积物-水界面的运输过程,例如地下水排放或孔隙水交换。了解这些运输过程非常重要,因为它们会影响湖泊的水预算或由于养分输入而影响湖泊的生物地球化学循环。我们在此介绍埃及第二大湖泊Burullus湖(埃及北部)的季节性222 Rn质量平衡。湖接收222从排水Rn和衰变226镭,并失去222经由衰减Rn中222 Rn,则大气逃税和水排放到地中海。但是,质量平衡显示有222的显着盈余Rn,不能用前面提到的过程来解释。在222 Rn中剩余是特别高在旱季,并且可能通过地下水排放和运输孔隙水交换来解释222 Rn中入湖。高222 Rn中通量进入枯水期湖水可能是由较高的bioirrigation率由于气温回暖,或更高的地下水排泄率来解释由于较高的水头在陆地相邻领域造成过度灌溉。为了进一步了解地下水排放和孔隙水交换是否对Burullus湖的水量预算和生物地球化学循环有影响,应对其进行详细调查。

更新日期:2020-10-17
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