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We investigate the role of the delineated cosmic web/filaments on the starformation activity by exploring a sample of 425 narrow-band selected H{\alpha}emitters, as well as 2846 color-color selected underlying star-forming galaxiesfor a large scale structure (LSS) at z=0.84 in the COSMOS field from the HiZELSsurvey. Using the scale-independent Multi-scale Morphology Filter (MMF)algorithm, we are able to quantitatively describe the density field anddisentangle it into its major components: fields, filaments and clusters. Weshow that the observed median star formation rate (SFR), stellar mass, specificstar formation rate (sSFR), the mean SFR-Mass relation and its scatter for bothH{\alpha} emitters and underlying star-forming galaxies do not strongly dependon different classes of environment, in agreement with previous studies.However, the fraction of H{\alpha} emitters varies with environment and isenhanced in filamentary structures at z~1. We propose mild galaxy-galaxyinteractions as the possible physical agent for the elevation of the fractionof H{\alpha} star-forming galaxies in filaments. Our results show thatfilaments are the likely physical environments which are often classed as the"intermediate" densities, and that the cosmic web likely plays a major role ingalaxy formation and evolution which has so far been poorly investigated.

Cosmic Web and Star Formation Activity in Galaxies at z~1