Early Monsoon Time Local Flow Characteristics over the Hetauda Valley and its Implications

• DOI: 10.3126/jist.v19i2.13863
• Publication Date: 2015-11-10T09:48:14Z
• Authors: S. Acharya; S. Neupane; R. Shrestha; C. Chapagain; P. Acharya; S. Maharjan; R. Regmi
• Keywords: Prevailing winds

The early monsoon time atmospheric transport processes over the Hetauda valley, closest low-land that accommodates third largest industrial district of Nepal, has been studied with application Weather Research and Forecasting (WRF) Modeling System initialized NCEP meteorological USGS terrain elevation land-use data. study reveals mixing layer valley may evolve as much 3 km above surface during afternoon time. near atmosphere appears very weakly stratified even in morning indicating prevailing meteorology favors efficient dispersion air pollutants. also daytime upslope winds associated northern mountains effectively intrude into Kathmandu enhancing southwesterly northwesterly wind system valley. Intrusion local flows to be accompanied excitation mountain waves plain-to-plateau wind. Formation lowlevel rotors strong downdrafts southwestern part put aircrafts high risk. pattern flow fields strongly suggest increase emissions can have significant help further deteriorate already unhealthy Kathmandu.Journal Institute Science Technology, 2014, 19(2): 109-117