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 | UNSW > CVEN HOME > Staff > Ashish Sharma | |
|  Staff Staff DirectoryStaff Area (Restricted)Staff Homepage Ashish Sharma Ashish Sharma's Publications | |
Ashish SharmaBE Roorkee, MTech IIT Delhi, PhD Utah State Associate ProfessorContact DetailsOffice Location: Teaching Areas
Research AreasStochastic hydrology Synthetic generation of seasonal streamflow; Single and multi-site generation of daily rainfall; Identification of long-term memory in hydrological time series. Probabilistic forecasting and downscaling Predictor identification strategies for formulating probabilistic forecasting models; Partial Mutual Information (PMI); Medium to long-term forecasting of seasonal rainfall using hydroclimatic forcing variables; Stochastic downscaling of rainfall and evapotranspiration through a Catchment Scale Climate Change Assesment Framework. Radar hydrology Uncertainty analysis in radar rainfall relationships; Probability based calibration techniques for estimation of radar rainfall. Bayesian hydrology Use of Bayesian techniques in rainfall-runoff modelling; Markov Chain Monte Carlo sampling for selection of hydrologic models. Water Resources Management Uncertainty and risk analysis of water resources systems; Optimal reservoir management using time series and probabilistic forecasting techniques. Other Always interested in new developments in statistics and how they can be put to use to solve water problems. Current and Recent Grants (from 2006)Sharma, Pitman (UNSW), Tuteja (BoM); Integrated assessment of climate change, climate input errors and land-use change on soil-moisture and carbon-balance in a catchment simulation framework; ARC Linkage with NSW DECC Industry Partner support, $352,000, 2008-2011. Sharma, Nott (NUS), Marshall (Montana), An Ensemble Modelling Framework for Prediction in Ungauged Catchments, ARC Discovery Grant, $355,000, 2008-2011. Sharma, Ball (UTS), Sivakumar (UC-Davis), Stochastic Rainfall Generation for design flow simulation, ARC Discovery grant, $220,000, 2006-2008. Sharma, Cordery (UNSW), Kibria (Sydney Catchment Authority), A Stochastic Downscaling Framework for Catchment Scale Climate Change Impact Assessment, ARC Linkage grant with Sydney Catchment Authority Support , $342,000, 2006-2008. Bates (CSIRO), Sharma, others, Climate change and its impact on water supply and demand in Sydney, Australian Greenhouse Office, Sydney Water, Sydney Catchment Authority, NSW Cabinet Office, $800,000, 2006-2008. Selected PublicationsRecent Journal Publications and Book Chapters (from 2006)2009 Chowdhury, S. and Sharma, A., 2009. Long Range NINO3.4 Predictions Using Pair Wise Dynamic Combinations of Multiple Models. Journal of Climate: doi: 10.1175/2008JCLI2210.1. Frost, A., Mehrotra, R., Sharma, A. and Srikanthan, R., 2009. Comparison of statistical downscaling techniques for multi-site daily rainfall conditioned on atmospheric variables for the Sydney region. Australian Journal of Water Resources: in press. Johnson, F. and Sharma, A., 2009. Measurement of GCM skill in predicting variables relevant for hydroclimatological assessments. Journal of Climate, in press(DOI: 10.1175/2009JCLI2681.1). Mapiam, P., Sriwongsatinon, N., Chumchean, S. and Sharma, A., 2009. Effect of rain gauge temporal resolution on the Z~R relationship. Journal of Atmospheric and Oceanic Technology, in press (accepted 2/2/2009). Mehrotra, R. and Sharma, A., 2009. Evaluating spatio-temporal representations in daily rainfall sequences from three stochastic multisite weather generation approaches. Advances in Water Resources, in press. Wasko, C. and Sharma, A., 2009. The effect of Solar Variability on Atmospheric Moisture Storage. Geophysical Research Letters, 36(L03703): doi:10.1029/2008GL036310. Westra, S., Brown, C., Lall, U., Koch, I. and Sharma, A., 2009. Use of principal component analysis, Varimax and independent component analysis for interpretation of modes of climate variability. International Journal of Climatology, in press (accepted 31/1/2009). 2008 Chowdhury, S. and Sharma, A., 2008. A simulation based approach for representation of rainfall uncertainty in conceptual rainfall runoff models. Hydrological Research Letters, 2(DOI: 10.3178/HRL.2.2): 5-8. Sivakumar, B. and Sharma, A., 2008. A cascade approach to continuous rainfall generation at point locations. Stochastic Environmental Research and Risk Assessment (SERRA)(DOI 10.1007/s00477-007-0145-y): 1-9. Westra, S., Sharma, A., Brown, C. and Lall, U., 2008. Multivariate streamflow forecasting using independent component analysis. Water Resources Research, 44, W02437(doi:10.1029/2006WR005785 ). Chumchean, S., Seed, A. and Sharma, A., 2008. An operational approach for classifying storms in real-time radar rainfall estimation. Journal of Hydrology: doi:10.1016/j.jhydrol.2008.09.005. 2007 Chowdhury, S. and Sharma, A., 2007. Mitigating Parameter Bias in Hydrological Modelling due to Uncertainty in Covariates. Journal of Hydrology, 340(doi:10.1016/j.jhydrol.2007.04.010): 197-204. Marshall, L., Nott, D.J. and Sharma, A., 2007. Towards dynamic catchment modeling: A Bayesian Hierarchical Mixtures of Experts framework. Hydrological Processes, 21: 847-861. Marshall, L., Sharma, A. and Nott, D.J., 2007. A single model ensemble versus a dynamic modeling platform: semi-distributed rainfall runoff modeling in a Hierarchical Mixtures of Experts framework. Geophysical Research Letters, 34(L01404). Mehrotra, R. and Sharma, A., 2007. Preserving low-frequency variability in generated daily rainfall sequences. Journal of Hydrology, 345(doi:10.1016/j.jhydrol.2007.08.003): 102-120. Mehrotra, R. and Sharma, A., 2007. A semi-parametric model for stochastic generation of multi-site daily rainfall exhibiting low-frequency variability. Journal of Hydrology, 335(1-2): 180-193. Ruiz, J.E., Cordery, I. and Sharma, A., 2007. Forecasting streamflows in Australia using the tropical Indo-Pacific thermocline as predictor. Journal of Hydrology, 341: 156-164. Srikanthan, R., Sharma, A. and McMahon, T.A., 2007. Closure to 'Comparison of Two Nonparametric Alternatives for Stochastic Generation of Monthly Rainfall' ASCE Journal of Hydrologic Engineering, 11(DOI: 10.1061/(ASCE)1084-0699(2006)11:3(222)). Westra, S., Brown, C., Lall, U. and Sharma, A., 2007. Modelling multivariable hydrological series: Principal Component Analysis or Independent Component Analysis? Water Resources Research, 43(W06429): doi:10.1029/2006WR005617. 2006 Chumchean, S., Seed, A. and Sharma, A., 2006. Correcting of real-time radar rainfall bias using a Kalman filtering approach. Journal of Hydrology, 317(1-2): 123-137. Chumchean, S., Sharma, A. and Seed, A., 2006. An integrated approach to error correction for real-time radar-rainfall estimation. Journal of Atmospheric and Oceanic Technology, 23(1): 67-79. Marshall, L., Sharma, A. and Nott, D.J., 2006. Modelling the Catchment via Mixtures: Issues of Model Specification and Validation. Water Resources Research, 42(doi:10.1029/2005WR004613): W11409. Mehrotra, R. and Sharma, A., 2006. Conditional resampling of hydrologic time series using multiple predictor variables: A k-nearest neighbour approach. Advances in Water Resources, 29: 987-999. Mehrotra, R. and Sharma, A., 2006. A nonparametric stochastic downscaling framework for daily rainfall at multiple locations. Journal of Geophysical Research-Atmospheres, 111(D15101): doi:10.1029/2005JD006637. Mehrotra, R., Srikanthan, R. and Sharma, A., 2006. A comparison of three stochastic multi-site precipitation occurrence generators. Journal of Hydrology, 331: 280-292. Ruiz, J.E., Cordery, I. and Sharma, A., 2006. Impact of mid-Pacific Ocean thermocline on the prediction of Australian rainfall. Journal of Hydrology, 317(1-2): 104-122. Srikanthan, R., Sharma, A. and McMahon, T.A., 2006. Comparison of two nonparametric alternatives for stochastic generation of monthly rainfall. Journal of Hydrologic Engineering, 11(3): 222-229. Westra, S. and Sharma, A., 2006. Dominant modes of interannual variability in Australian rainfall analyzed using wavelets - art. no. D05102. Journal of Geophysical Research-Atmospheres, 111(D5): 5102-5102. Professional Services
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