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Investigating meteorological effect on river flow recession rate in an arid environment
Hydrological Sciences Journal ( IF 3.5 ) Pub Date : 2020-08-05 , DOI: 10.1080/02626667.2020.1798009 Luminda Niroshana Gunawardhana 1 , Ghazi A. Al-Rawas 1
Hydrological Sciences Journal ( IF 3.5 ) Pub Date : 2020-08-05 , DOI: 10.1080/02626667.2020.1798009 Luminda Niroshana Gunawardhana 1 , Ghazi A. Al-Rawas 1
Affiliation
ABSTRACT This study explores previously unreported linkage between recession rates of rainfall hyetograph and river flow hydrograph in an arid environment in Sultanate of Oman. Ephemeral streams are hydraulically disconnected from groundwater aquifers and depend on rainfall to produce water that flows only for hours or a few days at most. It therefore prompted to hypothesize that the recession rate of the rainfall event controls the corresponding recession of river flow. To test this assumption, 1-h river flow rates and 20-min rainfall rates in Al-Khoud catchment area for the period 1997–2013 were analysed. The river flow recession rate and antecedent river flow were found to be inversely proportional, while their relation improved with increasing time span of cumulating the antecedent river flow. The results further show that the simulation of river flow recession rate can be improved by incorporating the combined effects of rainfall recession rate and antecedent moisture content.
中文翻译:
调查气象对干旱环境中河流流量衰退率的影响
摘要 本研究探讨了以前未报告的阿曼苏丹国干旱环境中降雨量流线图和河流流量线图的衰退率之间的联系。短暂的溪流在液压上与地下水含水层断开,依靠降雨产生的水最多只能流动数小时或数天。因此提出假设降雨事件的衰退速率控制了相应的河流流量衰退。为了检验这一假设,对 1997-2013 年期间 Al-Khoud 集水区的 1 小时河流流量和 20 分钟降雨率进行了分析。发现河流流量衰退率与先行河流流量成反比,而随着先行河流流量累积时间跨度的增加,两者的关系有所改善。
更新日期:2020-08-05
中文翻译:
调查气象对干旱环境中河流流量衰退率的影响
摘要 本研究探讨了以前未报告的阿曼苏丹国干旱环境中降雨量流线图和河流流量线图的衰退率之间的联系。短暂的溪流在液压上与地下水含水层断开,依靠降雨产生的水最多只能流动数小时或数天。因此提出假设降雨事件的衰退速率控制了相应的河流流量衰退。为了检验这一假设,对 1997-2013 年期间 Al-Khoud 集水区的 1 小时河流流量和 20 分钟降雨率进行了分析。发现河流流量衰退率与先行河流流量成反比,而随着先行河流流量累积时间跨度的增加,两者的关系有所改善。