scholarly journals Spatial Distribution and Temporal Trends in the Daily Precipitation Concentration across the Yarlung Tsangpo River Basin: Eastern Himalaya of China

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Mengtao Zhu ◽  
Meng Li ◽  
Chunyu Liu ◽  
Yinfei Wang ◽  
Jiqiu Li ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
River Basin ◽  
Daily Precipitation ◽  
Temporal Trends ◽  
Dry Season ◽  
Precipitation Concentration ◽  
Rescaled Range Analysis ◽  
Significant Downward Trend ◽  
Yarlung Tsangpo ◽  
Yarlung Tsangpo River

Understanding the temporal inequality in precipitation is of great importance for water resource management, environmental risk management, and ecological conservation. This study investigated the spatial patterns and trends of the daily precipitation concentration over the Yarlung Tsangpo River Basin using the concentration index (CI) and the Lorentz asymmetric coefficient (LAC). A Mann–Kendall test and Hurst’s rescaled range analysis were used to detect the change in CI trends. The CI ranged from 0.58 to 0.65, suggesting that a quarter of the rainiest days contributed approximately 69–78% of the total precipitation. The LAC analysis indicated that the nonuniform distribution of precipitation was mainly attributed to a large proportion of days with light rainfall. Compared with that of the central region, the daily precipitation in the western and eastern regions was more irregular. At a seasonal scale, the dry season had a less homogeneous spatial distribution of CI compared to that of the wet season. Most areas exhibited no significant trends in CI from 1970 to 2017. A quarter of the stations presented a significant downward trend in CI, which were primarily found in the central and northern regions. In addition, the future trends of CI in most areas mostly agree with those of the current state; however, the majority of stations exhibited an uneven precipitation distribution in the dry season.

Changes of land cover in the Yarlung Tsangpo River basin from 1985 to 2005

2012 ◽  
Vol 68 (1) ◽  
pp. 181-188 ◽  
Author(s):  
Fapeng Li ◽  
Zongxue Xu ◽  
Youcan Feng ◽  
Mei Liu ◽  
Wenfeng Liu
Keyword(s):  
Land Cover ◽  
River Basin ◽  
Yarlung Tsangpo ◽  
Yarlung Tsangpo River

Spatiotemporal characteristics of water budget dynamic in the Yarlung Tsangpo River basin of Tibetan Plateau based on multi-source datasets

2020 ◽  
Author(s):  
Yao Jiang ◽  
Zongxue Xu
Keyword(s):  
Tibetan Plateau ◽  
River Basin ◽  
Water Budget ◽  
Water Resource Management ◽  
The Tibetan Plateau ◽  
Water Budgets ◽  
Climate Conditions ◽  
Basin Scale ◽  
Yarlung Tsangpo ◽  
Yarlung Tsangpo River

<p>Understanding the dynamics of basin-scale water budgets over the Tibetan Plateau (TP) is significant for hydrology and water resource management in the southern and eastern Asia. However, a detailed water balance analysis is limited by the lack of adequate hydro-climatic observations in this region. In this study, we investigate the spatiotemporal variation of water budget components (e.g. precipitation P, evapotranspiration ET and runoff Q etc.) in the Yarlung Tsangpo River basin (YTB) of southeast TP during the period of 1975-2015 through using multi-source datasets (e.g. insitu observation, remote sensing data products, reanalysis outputs and model simulations etc.). The change trend of water budget components and vegetation parameters was analyzed in the YTB on interannual scale. The results indicated that the detailed water budgets are different from upstream to downstream YTB due to different temperature, vegetation cover and evapotranspiration, which are mainly affected by different climate conditions. In the whole basin, precipitation that are mainly during June to October was the major contributor to the runoff. The P and Q were found to show a slight but insignificant decrease in most regions of YTB since the late 1990s, which showed positive relationships with the weakening Indian summer monsoon. While the ET showed an insignificant increase across most of the YTB, especially in the middle basin. The runoff coefficient (Q/P) exhibited an indistinctively decreasing trend which may be, to some extent, due to the overlap effects of ET increase and snow and glacier changes. The obtained results offer insights into understanding the evolution mechanism of hydrological processes in such a data-sparse region under changing environment.</p>

Spatial Distribution and Temporal Trends in Precipitation Concentration Indices for the Southwest China

2015 ◽  
Vol 29 (11) ◽  
pp. 3941-3955 ◽  
Author(s):  
Peng Shi ◽  
Miao Wu ◽  
Simin Qu ◽  
Peng Jiang ◽  
Xueyuan Qiao ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Southwest China ◽  
Temporal Trends ◽  
Precipitation Concentration ◽  
Concentration Indices

scholarly journals Feeding ecology of Dash-dot Tetra Hemigrammus belottii(Steindachner 1882) (Characiformes: Characidae) in the streams of the Urucu River basin, central Amazonia, Brazil

2013 ◽  
Vol 13 (3) ◽  
pp. 141-147 ◽  
Author(s):  
Andrey Felipe Gomes Gonçalves ◽  
Bruno da Silveira Prudente ◽  
Fernando da Silva Carvalho Filho ◽  
Luciano Fogaça de Assis Montag
Keyword(s):  
Spatial Distribution ◽  
River Basin ◽  
Feeding Ecology ◽  
Standard Length ◽  
Diet Composition ◽  
Feeding Habits ◽  
Dry Season ◽  
Feeding Intensity ◽  
Central Amazonia

The present study describes aspects of feeding ecology of Dash-dot TetraHemigrammus belottii (Characiformes: Characidae) collected in the Urucu River basin in Coari, Amazonas (Brazil), aims to respond the following question: What is the influence of hydrological periods (dry and wet) and spatial distribution in the diet of H. belottii? The specimens were collected between 2006 and 2009 in seven streams in the Urucu basin using standard capture methods. Their stomachs were removed for diet composition analyses. The alimentary items were weighed and identified for subsequent analyzes related to feeding intensity by repletion index (RI%) and importance by alimentary index (AIi%). A total of 227 specimens were analyzed, with a mean standard length of 16.5±5.6 mm. The RI% values indicated that H. belottii fed more intensively during the dry season. The principal items in the diet were Formicidae (IAi% = 69.6), fragments of allochthonous exoskeleton (IAi% = 17.7), and Coleoptera (IAi% = 6.0). The composition of the diet did not vary significantly between seasons or among habitats, which may be related to the abundance of the items exploited by the species throughout the year. Hemigrammus belottii showed a generalist insectivore feeding habits which was mainly composed by allochthonous item.

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