Kabir et al. 2022; Mekong Precipitation Uncertainty -- Water Resources Research

Authors:
Yadu Pokhrel
Owners: Yadu Pokhrel
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Created: Feb 20, 2022 at 1:22 p.m.
Last updated: Feb 20, 2022 at 1:48 p.m.
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Content types: Multidimensional Content  Multidimensional Content 
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Abstract

Numerous studies have examined the reliability of various precipitation products over the Mekong River Basin (MRB) and modeled its basin hydrology. However, there is a lack of comprehensive studies on precipitation-induced uncertainties in hydrological simulations using process-based land surface models. This study examines the propagation of precipitation uncertainty into hydrological simulations over the entire MRB using the Community Land Model version 5 (CLM5) at a high spatial resolution of 0.05° (~5 km) and without any parameter calibration. Simulations conducted using different precipitation datasets are compared to investigate the discrepancies in streamflow, terrestrial water storage (TWS), soil moisture, and evapotranspiration (ET) caused by precipitation uncertainty. Results indicate that precipitation is a key determinant of simulated streamflow in the MRB; peak flow and soil moisture are particularly sensitive to precipitation input. Further, precipitation data with a higher spatial resolution did not improve the simulations, contrary to the common perception that using meteorological forcing with higher spatial resolution would improve hydrological simulations. In addition, since high flow indicators are particularly influenced by precipitation data, the choice of precipitation data could directly impact flood pulse simulations in the MRB. Notable differences are also found among TWS, soil moisture, and ET simulated using different precipitation products. Moreover, TWS, soil moisture, and ET exhibit a varying degree of sensitivity to precipitation uncertainty. This study provides crucial insights on precipitation-induced uncertainties in process-based hydrological modeling and uncovers these uncertainties in the MRB.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Mekong River basin, Southeast Asia
North Latitude
22.7844°
East Longitude
110.2720°
South Latitude
7.8286°
West Longitude
94.0562°
Leaflet Map data © OpenStreetMap contributors

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How to Cite

Pokhrel, Y. (2022). Kabir et al. 2022; Mekong Precipitation Uncertainty -- Water Resources Research, HydroShare, http://www.hydroshare.org/resource/b3f39f9b563242cfa967a1c3039b52d5

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