Hydrological processes in tropical Australia: Historical perspective and the need for a catchment observatory network to address future development

Duvert, Clément; Lim, Han-She; Irvine, Dylan J.; Bird, Michael I.; Bass, Adrian M.; Tweed, Sarah; Hutley, Lindsay B.; Munksgaard, Niels C.

doi:10.1016/j.ejrh.2022.101194

Cited by 1 publication

(1 citation statement)

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“…ALPHA_BNK controls the bank storage in a sub-basin, which contributes to river flow and reaches within the sub-basin. Return flow from bank storage is an important process that contributes significant proportions of baseflow to large rivers [53]. SOL_AWC varies with soil type (more for loam and clay) and strongly influences the percolation, evaporation, and lateral flow [50].…”

Section: Lulc Change At the Sub-watershed Scalementioning

confidence: 99%

Effects of Dynamic Land Use/Land Cover Change on Flow and Sediment Yield in a Monsoon-Dominated Tropical Watershed

Sadhwani

Eldho

Jha

et al. 2022

Water

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It is widely known that land use/land cover (LULC) changes significantly alter watershed hydrology and sediment yields. The impact, especially on erosion and sedimentation, is likely to be exacerbated in regions dominated by high rainfall patterns such as monsoons. This study analyzed the hydrological responses of LULC changes in terms of streamflow (SF) and sediment yield (SY) in a monsoon-dominated tropical watershed, the Periyar River Watershed (PRW) in Kerala, India. This watershed drains an area of 4793 km2 characterized by an average monsoon rainfall of 2900 mm from June to November. The watershed hydrology and sediment dynamics were simulated using the Soil and Water Assessment Tool (SWAT) model for the impact assessment at the watershed outlet and the sub-watershed level. Historical LULC data were analyzed for 1988, 1992, 2002, and 2016 using the maximum likelihood method, and future LULC changes were projected for 2030, 2050, 2075, and 2100 using the Markov chain–cellular automata technique. Between 1988 and 2016, the urban area increased by 4.13 percent, while plantation and forest coverage decreased by 1.5 percent. At this rate, by 2100, the urban area is expected to grow by 16.45% while plantations and forest area will shrink by 13.7% compared to 1988. The effects of these changes on SF and SY were found to be minimal at the watershed outlet; however, at the spatial scale of sub-watersheds, the changes varied up to 70% for surface runoff and 200% for SY. These findings highlight the potential impacts of LULC changes in a monsoon-dominated watershed and may contribute to the development of successful LULC-based watershed management strategies for prevention of flooding and sediment loss.

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Section: Lulc Change At the Sub-watershed Scalementioning

confidence: 99%