Impact of terrain complexity on the turbulence drag coefficient: A case study from the Indian Himalayan region

被引:6
|
作者
Lohani, Priyanka [1 ]
Mukherjee, Sandipan [1 ]
机构
[1] GB Pant Natl Inst Himalayan Environm, Kosi Katarmal 263643, Almora, India
关键词
Drag coefficient; Himalayan terrain; Surface roughness; ROUGHNESS LENGTH; SURFACE;
D O I
10.1016/j.dynatmoce.2021.101201
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The aerodynamic drag coefficient (CD) is conjectured to change (or remains almost uniform) with the horizontal wind speed (U) over a flexible (or fixed) surface element, which is represented with the surface roughness (z(0)). This conjecture is tested for the near neutral atmospheric turbulence (i.e. when surface stability z/L is almost equal to 0, where z is the measurement height and L is Obukhov length) of monsoon and winter season at an on-slope and a ridge-top site in the Indian Himalaya, wherein the ridge-top site is associated with a higher degree of sensitivity to the roughness element and terrain attributes. This hypothesis is successfully verified for two conditions, (i) the monsoon period observations of ridge-top site are found to have higher z(0) due to vegetative growth than the winter period for flows having similar terrain signature, and (ii) the monsoon and winter period observations of on-slope site are noted to have similar z(0) for flows having signature of steep terrain. Subsequently, constants (i.e. a and b) of the power-law relationships between C-D and U (i.e. C-D = aU(b)), as a function of z(0), are optimized. It is noted that the relationship between C-D and U has higher sensitivity towards the terrain slope than the vegetative growth.
引用
收藏
页数:7
相关论文
共 50 条
  • [1] Impact of terrain complexity on the turbulence drag coefficient: A case study from the Indian Himalayan region
    Lohani, Priyanka
    Mukherjee, Sandipan
    Mukherjee, Sandipan (sandipan@gbpihed.nic.in), 1600, Elsevier Ltd (93):
  • [2] Bioresource, energy and forest sustainability: A case study from Indian Himalayan region
    Dasgupta, Soumya
    Badola, Ruchi
    Ali, Sk Zeeshan
    Tariyal, Prashant
    JOURNAL OF CLEANER PRODUCTION, 2022, 337
  • [3] Promoting outreach through conservation education programmes - Case study from Indian Himalayan Region
    Dhar, U
    Rawal, RS
    Airi, S
    Bhatt, ID
    Samant, SS
    CURRENT SCIENCE, 2002, 82 (07): : 808 - 815
  • [4] Tectonic morphometric studies as a tool for terrain characterization in the Himalayan foothill region — A case study
    A. R. Chaudhri
    Journal of the Geological Society of India, 2012, 79 : 210 - 218
  • [5] Tectonic morphometric studies as a tool for terrain characterization in the Himalayan foothill region - A case study
    Chaudhri, A. R.
    JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA, 2012, 79 (02) : 210 - 218
  • [6] Construction Practices and Seismic Vulnerability of Buildings in the Indian Himalayan Region: A Case Study
    Aggarwal, Yati
    Saha, Sandip Kumar
    Baddipalli, Shivalinga
    NATURAL HAZARDS REVIEW, 2024, 25 (02)
  • [7] A Novel Approach for Forest Fragmentation Susceptibility Mapping and Assessment: A Case Study from the Indian Himalayan Region
    Batar, Amit Kumar
    Shibata, Hideaki
    Watanabe, Teiji
    REMOTE SENSING, 2021, 13 (20)
  • [8] NUMERICAL STUDY OF TURBULENCE ON DRAG COEFFICIENT DETERMINATION FOR PARTICLE AGGLOMERATES
    Arbach, Ricardo
    De Oliveira, Fernandes
    Zanata, Julio Henrique
    Lopes, Gabriela Cantarelli
    CHEMICAL INDUSTRY & CHEMICAL ENGINEERING QUARTERLY, 2023, 30 (02) : 161 - 177
  • [9] Climate change impact and vulnerability assessment of forests in the Indian Western Himalayan region: A case study of Himachal Pradesh, India
    Upgupta, Sujata
    Sharma, Jagmohan
    Jayaraman, Mathangi
    Kumar, Vijay
    Ravindranath, N. H.
    CLIMATE RISK MANAGEMENT, 2015, 10 : 63 - 76
  • [10] A phenomenological study of tourists' categories in the Indian Himalayan Region
    Chandra, Pramod
    INTERNATIONAL JOURNAL OF TOURISM RESEARCH, 2024, 26 (03)