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We investigate the properties of HI-rich galaxies detected in blind radiosurveys within the hierarchical structure formation scenario using asemi-analytic model of galaxy formation. By drawing a detailed comparisonbetween the properties of HI-selected galaxies and HI absorption systems, weargue a link between the local galaxy population and quasar absorption systems,particularly for Damped Ly-alpha absorption (DLA) systems and sub-DLA systems.First, we evaluate how many HI-selected galaxies exhibit HI column densities ashigh as those of DLA systems. We find that HI-selected galaxies with HI massesM(HI) > 10^8 solar masses have gaseous disks that produce HI column densitiescomparable to those of DLA systems. We conclude that DLA galaxies where the HIcolumn densities are as high as those of DLA systems, contribute significantlyto the population of HI-selected galaxies at M(HI) > 10^8 solar masses. Second,we find that star formation rates (SFRs) correlate tightly with HI massesrather than B- (and J-) band luminosities.  In the low-mass range M(HI) < 10^8 solar masses, sub-DLA galaxies replace DLAgalaxies as the dominant population. The number fraction of sub-DLA galaxiesrelative to galaxies reaches 40%-60% at HI masses 10^8 solar masses and 30%-80%at 10^7 solar masses. The HI-selected galaxies at 10^7 solar masses are astrong probe of sub-DLA systems that place stringent constraints on galaxyformation and evolution.

HI-selected Galaxies as a probe of Quasar Absorption Systems