Spatiotemporal Water Yield Variations and Influencing Factors in the Lhasa River Basin, Tibetan Plateau

Lu, Huiting; Yan, Yan; Zhu, Jinwei; Jin, Tiantian; Liu, Guohua; Wu, Gang; Stringer, Lindsay C.; Dallimer, Martin

doi:10.3390/w12051498

Cited by 18 publications

(14 citation statements)

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“…The statistical analysis report of BRTs demonstrates that the precipitation and baseflow were two of the principal factors that influenced WY on all spatio-temporal scales. Precipitation is one of the important factors that governs WY as previously reported by Jiang et al (2016); Sun et al (2019) and Lu et al (2020) is used by policymakers, especially in water resources management and goals in conducting apportioning of water resources. The baseflow is one of the key components of the groundwater system, which provides sub-surface flow and other delayed sources like snowmelt into the stream, which is the second most important factor contributing to WY.…”

Section: Discussionmentioning

confidence: 97%

“…An attempt at WY services as well as impacts of multi-dimensional aspects over spatio-temporal scales employing different methodologies have been explored in the past. Sun et al (2019) analyzed the basin and climate factor contributions to the WY using the coupled hydrological model SWAT and statistical tool Boosted Regression Trees (BRTs) at spatio-temporal scales; the WY and its dominant factors including land cover, precipitation, the Normalized Difference Vegetation Index (NDVI) by the Seasonal Water Yield Model (Lu et al 2020) at spatio-temporal scales; long-term groundwater recharge studies using the partially-distributed water balance model WetSpass and investigated the influencing factors by the correlation technique (Zomlot et al 2015). Other relationships between the WY and parameters like potential evapotranspiration (PET) (Wang et al 2011), glacier, and snow melt (Anand et al 2018;Li et al 2021) have also been reported.…”

Section: Introductionmentioning

confidence: 99%

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Quantifying the significance of basin parameters and hydro-climatic factors to water and sediment yields across spatio-temporal scales in mountainous river Basin, Sikkim

Lepcha

Pandey

2022

Journal of Water and Climate Change

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The precise identification of basin characteristics and climate factors that plays a significant role in determining water and sediment yield is of paramount importance. However, due to the enormous complexity associated with the hydrologic cycle, it is usually challenging to extricate the influence of individual parameters on the combined water and sediment yield responses. To accomplish this, a combined hydrological modelling and statistical approach was adopted in this study. The Soil and Water Assessment Tool (SWAT) model was adopted to simulate different components of the watershed and the results were utilized in Boosted Regression Trees (BRTs) to analyze the contribution of different parameters to water and sediment yield at spatio-temporal and seasonal scales in the upstream Teesta River basin. The outcomes of the analysis showed that precipitation and baseflow play a crucial role in regulating the water yield at all spatio-temporal scales. On the other hand, precipitation alone has a key role in determining the sediment yield, especially at the daily (49.30%) and monthly (21.14%) temporal scales. The relative contribution of the remaining parameters at a yearly temporal scale, and small and intermediate spatial scales showed relatively close results with an exception at the large basin scale (precipitation alone by 35.88%). The average contribution of actual evapotranspiration was found less on both water and sediment yield prediction in all spatio-temporal scales considered. The analysis also revealed that the precipitation, baseflow, and minimum temperature play a key role in regulating the water and sediment yield in both monsoon and non-monsoon seasons, whereas the contribution of maximum temperature and snowmelt was found less during monsoon and non-monsoon seasons. The outcomes of this study may assist policymakers and water managers in rational water management goals as well as in coping soil degradation issues.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Quantifying the significance of basin parameters and hydro-climatic factors to water and sediment yields across spatio-temporal scales in mountainous river Basin, Sikkim

Lepcha

Pandey

2022

Journal of Water and Climate Change

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“…Five status levels were detected throughout the study periods, with fluctuating maximum and minimum values. This is not uncommon as quickflow characterisation is never highly dynamic [29]. However, the quickflow of the Sokoto-Rima basin is dominated by low flow levels with very low and low statuses.…”

Section: Spatiotemporal Dynamics Of Quickflow In the Sokoto-rima Basinmentioning

confidence: 99%

“…For instance, [8] asserted that water yield is a function of a consistent increase in the amount of rainfall received per time in the Sokoto-Rima basin. [29] stated that apart from precipitation dynamics, landcover, change in vegetation could affect water yield, out of which quickflow is significant. [29] further affirmed that quickflow in low rainfall grassland area of Tibet contributes roughly 5% to water yield.…”

Section: Spatiotemporal Dynamics Of Quickflow In the Sokoto-rima Basinmentioning

confidence: 99%

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Spatial Appraisal of Seasonal Water Yield of the Sokoto-Rima Basin

Raji¹

2021

Sakarya University Journal of Science

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Understanding the dynamics of water yield related to water balance is vital for the functioning of ecosystems and model-based computation of their respective ecosystem services. This is important for valuable water resource planning and management in dryland regions, such as the Sokoto-Rima basin. In this study, we assess the spatiotemporal dynamics of quickflow (QF), local recharge (LR), and baseflow (B) between 1992 and 2015 with the use of the Seasonal Water Yield (SWY) model of InVEST (Integrated Valuation of Ecosystem Service and Tradeoffs) software. Pre-classified landcover, rainfall, satellite-derived evapotranspiration, digital surface topography, and HYSOGs 250m soil datasets were used as software input. The result of the study showed that QF, LR, and B depict similar spatial distribution with peak values generated within water-bearing landcover areas, particularly water bodies and wetlands. QF was highest in 2002 (1,293.6 mm), and the subsequent years -2012 and 2015 had reductions. Similar patterns were observed in LR and B with much lower values. The temporal trend for the 23-year period of the study showed that QF had an increasing rate of 85.331 mm while decreasing rates of 56.131 mm and 27.597 mm were detected for LR and B, respectively. Three essential parametersalpha (α), beta (β), and gamma (γ) showed evidence of sensitivity to changes in seasonal water yield values. These water balance transactions provided an opportunity to review the impact of the sensitivity of the landcover, climate, and hydrogeological factors on water resources management, mainly freshwater accounting in the Sokoto-Rima basin of the northwestern part of Nigeria.

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Quantifying the impacts of climate change and human activities on runoff and suspended sediment load in the Lhasa River Basin, Tibetan Plateau

Zhang,

Zhao,

Zhang

et al. 2024

Earth Surf Processes Landf

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Quantifying the attribution of climate change and human activities on runoff and suspended sediment load is crucial for formulating future watershed management measures, especially in the ecologically fragile alpine region, which is more susceptible to climate change and human activities. In this study, the temporal changes in runoff‐suspended sediment load and the potential impact factors (i.e., precipitation, potential evapotranspiration (PET), land use/land cover change (LULC) and reservoir operation) were investigated in the Lhasa River Basin (LRB) from 1956 to 2020. In addition, the contributions of those factors to the changes in runoff and suspended sediment load were quantitatively evaluated based on physically‐based Soil and Water Assessment Tools (SWAT). The results indicated that annual runoff and suspended sediment load showed an increasing but insignificant trend during 1956–2020, while annual precipitation and PET showed a significant increasing trend at a rate of 0.94 and 1.07 mm/yr, respectively. LULC mainly presented an increase in forestland area followed by a decrease in grassland and bare land area due to the implementation of ecological projects. Runoff and suspended sediment load changed abruptly at approximately 1995 and 2005 based on three abrupt change identification methods, thus, the study period was further divided into three substages: baseline period (P0, 1956–1994), dramatically increased period (P1, 1995–2004) and slightly decreased period (P2, 2005–2020). The attribution analysis showed that climate change was the dominant contributor to runoff and suspended sediment load increments during P1. LULC caused the decline in runoff and suspended sediment load in both P1 and P2, with their contribution increasing significantly from 0.40% and 4.73% in P1 to 50.24% and 51.79% in P2, respectively. Reservoir operation was the second key factor in runoff and suspended sediment load reduction in P2, contributing 42.07% and 43.72%, respectively. These findings provide the scientific foundation for reasonably allocating water resources and statistical support for the benefit evaluation of implementing ecological projects in the basin.

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Spatiotemporal Water Yield Variations and Influencing Factors in the Lhasa River Basin, Tibetan Plateau

Cited by 18 publications

References 50 publications

Quantifying the significance of basin parameters and hydro-climatic factors to water and sediment yields across spatio-temporal scales in mountainous river Basin, Sikkim

Quantifying the significance of basin parameters and hydro-climatic factors to water and sediment yields across spatio-temporal scales in mountainous river Basin, Sikkim

Spatial Appraisal of Seasonal Water Yield of the Sokoto-Rima Basin

Quantifying the impacts of climate change and human activities on runoff and suspended sediment load in the Lhasa River Basin, Tibetan Plateau

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