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Effects of diurnal temperature rhythm on the geothermal regime under the embankment in Qinghai–Tibet plateau

تأثيرالتغييرات الحرارية اليومية على منظومة الحرارة الجوفية تحت سدة جنغهاي في هضبة التبت

Abstract

The objective of this study was to investigate the effects of diurnal temperature fluctuation amplitude (DTFA) on the geothermal regime of the embankment on the Qinghai–Tibet plateau. The investigation was simulated by respectively denoting the diurnal temperatures at the embankment surface, embankment slope, and natural ground surface with sinusoidal waves. The amplitudes of the waves were denoted by 0°C, 5°C, 8°C, and 12°C, respectively. The numerical result shows that the DTFA cannot vary the frequency of the seasonal temperature fluctuation of the underlying soil, but can significantly change the magnitude of the soil’s temperature. The changes include: (1) The high DTFA, such as 12°C, can significantly lead to the warming of the soil under the embankment. (2) Interestingly, when the DTFA at ground surface is 5°C, the underlying soil is in a cooler stage compared to when such DTFA is 0°C, 8°C, or12°C. This interesting result means that the documented model which ignores the diurnal temperature rhythm overestimates the warming of the underlying soil at the low DTFA region and underestimates such warming at the high DTFA region. This result also suggests that the soil under the embankment can be cooled down if the DTFA on the ground surface was maintained at or approximately at 5°C.

ملخص البحث

تم من خلال هذه الدراسة تحري تحري تأثير التغييرات اليومية لدرجة الحرارة على منظومة الحرارة الجوفية لسدة جنغهاي في هضبة التبت. تم متابعة التغييرات الحرارية على سطح السدة, سفح السدة و سطح الارض الطبيعي تحت السدة. تتخذ التغييرات الحرارية اليومية شكل موجة جيب بتباين يمثل الفرق بين قمة وقعر الموجة. تم دراسة فرق درجات الحرارة بمقدار صفر, خمسة, ثمانية , واثني عشر درجة مئوية. التحليل العددي للنتائج اظهر ان التغييرات اليومية لاتؤثر على تواتر التغييرات الموسمية ولكن يمكنها ان تؤثر بدرجة ملحوظة على درجة حرارة التربة. التأثيرات تشمل اولا: التباينات اليومية العالية مثل اثني عشر درجة مئوية يمكنها ان ترفع من درجة الحرارة تحت السدة, ثانيا: من المثير للاهتمام ان تباين درجة حرارة يومي بمقدار 5 درجات مئوية على السطح قد ادى الى درجة حرارة ابرد من تباين صفر , ثمان و اثني عشر درجة مئوية على التربة تحت السدة. هذا يدل على ان النموذج الرياضي الذي يهمل تأثيرات تواترالتغييرات اليومية في درجة الحرارة يبالغ في تقدير التسخين في حالة التباينات اليومية الواطئة في درجة الحرارة ويقلل من تقدير التسخين في حالة التباينات اليومية العالية في درجات الحرارة. يستنتج ايضا من النتائج انه يمكن تبريد التربة تحت السدة اذا تم المحافظة على تباين يومي بمقدار خمس درجات مئوية تقريبا لدرجة الحرارة على السطح.

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Correspondence to Yinghong Qin.

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Qin, Y., Tang, P. Effects of diurnal temperature rhythm on the geothermal regime under the embankment in Qinghai–Tibet plateau. Arab J Geosci 4, 259–267 (2011). https://doi.org/10.1007/s12517-010-0166-6

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  • DOI: https://doi.org/10.1007/s12517-010-0166-6

Keywords

  • Geo-temperature
  • Diurnal temperature fluctuation amplitude (DTFA)
  • Cold energy
  • Warm energy
  • Thermal regime