keywords CAPILLARY-PRESSURE COPULA METHOD Computer Science Computer Science, Interdisciplinary Applications ENSEMBLE KALMAN FILTER Engineering Engineering, Environmental Environmental Sciences Environmental Sciences & Ecology Hydrologic model Life Sciences & Biomedicine Maximal information coefficient Monte Carlo simulation NORTH-ATLANTIC PARTICLE FILTER Particle filter Physical Sciences Probabilistic collocation method RELATIVE PERMEABILITY RISK ANALYSIS STREAMFLOW OBSERVATIONS Science & Technology Sensitivity analysis TIGHT FORMATIONS Technology Uncertainty Water Resources XIANGXI RIVER