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HA Si, WANG Gui yong, DONG Guang rong. Lee-face Airflow,Depositional Types and Its Significance[J]. Acta Sedimentologica Sinica, 2001, 19(1): 96-100,124.
Citation: HA Si, WANG Gui yong, DONG Guang rong. Lee-face Airflow,Depositional Types and Its Significance[J]. Acta Sedimentologica Sinica, 2001, 19(1): 96-100,124.

Lee-face Airflow,Depositional Types and Its Significance

  • Received Date: 2000-04-25
  • Rev Recd Date: 2000-07-10
  • Field measurement of surface airflow,sand transport and sedimentary processes on the modern dunes(harchan dune) the main ridges and secondary ridges of networks dune)was conducted in southeastern Tengger Desert to refine aeolian cross-strata as an indicator of paleaowind direction. It has been found that the velocity and direction of lee-side secondary airflow varied with dune morphology and primary wind direction and their interactions.Three types of lee-side secondary flow occurred in this example separated flow, attached flow, and deflected flow. These flow is controlled at least two factors, lee-slop morphology and primary wind direction relative to dune crestline.Separated flow, characterized by lower wind velocity typically occurred on the dunes with steeper(>20°)lee-slop in the conditions where primary wind direction is perpendicular to dune crestline.Attached flow with higher velocity occurred on the gentle lee slop(<20°).The attacked flow could he deflected in the oblique primary wind environment but not deflected in transverse flow conditions.The direction of the lcc-side deflected flow is in accordance with the direction of crcstlinc of dunes regardless of the incident angle values of oblique wind.Further analysis has also found that the magnitude of lcc-side secondary wind velocity is the cosine function of primary wind direction relative to dunes which can he expressed by natural log cosine relationship: U1=Uc{K*ln(cos(i)〕+A}.0
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  • Received:  2000-04-25
  • Revised:  2000-07-10

Lee-face Airflow,Depositional Types and Its Significance

Abstract: Field measurement of surface airflow,sand transport and sedimentary processes on the modern dunes(harchan dune) the main ridges and secondary ridges of networks dune)was conducted in southeastern Tengger Desert to refine aeolian cross-strata as an indicator of paleaowind direction. It has been found that the velocity and direction of lee-side secondary airflow varied with dune morphology and primary wind direction and their interactions.Three types of lee-side secondary flow occurred in this example separated flow, attached flow, and deflected flow. These flow is controlled at least two factors, lee-slop morphology and primary wind direction relative to dune crestline.Separated flow, characterized by lower wind velocity typically occurred on the dunes with steeper(>20°)lee-slop in the conditions where primary wind direction is perpendicular to dune crestline.Attached flow with higher velocity occurred on the gentle lee slop(<20°).The attacked flow could he deflected in the oblique primary wind environment but not deflected in transverse flow conditions.The direction of the lcc-side deflected flow is in accordance with the direction of crcstlinc of dunes regardless of the incident angle values of oblique wind.Further analysis has also found that the magnitude of lcc-side secondary wind velocity is the cosine function of primary wind direction relative to dunes which can he expressed by natural log cosine relationship: U1=Uc{K*ln(cos(i)〕+A}.0

HA Si, WANG Gui yong, DONG Guang rong. Lee-face Airflow,Depositional Types and Its Significance[J]. Acta Sedimentologica Sinica, 2001, 19(1): 96-100,124.
Citation: HA Si, WANG Gui yong, DONG Guang rong. Lee-face Airflow,Depositional Types and Its Significance[J]. Acta Sedimentologica Sinica, 2001, 19(1): 96-100,124.
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