Temporal and spatial variations of precipitation in the Jinsha River basin during 1961–2010

Abstract

Knowing the variations of precipitation at the basin scale is very important to study the impacts of climate change on water resources and hydrological processes. To achieve the temporal and spatial variations of precipitation on long time scales and some extreme indicators in the Jinsha River basin, some typical precipitation indices were analysed based on daily precipitation data for 1961-2010 for the research area. The results showed that AP had a certain increasing tendency without passing the significance test, while AP in the lower reach of the basin decreased slightly. PFS had no obvious changes, while MP through a year (except rainfall in September and December) had a slight increasing tendency. In addition, AP and PFS showed obvious spatial differences, and the higher rainfall area was located in the lower basin especially in the Hengduan Mountain area. LRD and MRD increased slightly in the upper and middle regions, while they decreased slightly in the lower basin. HRD increased over most of the whole basin, but it had a decreasing tendency in the headwater region and around Dege station but did not pass the significance test. DD and CDD in one year showed similar spatial change patterns and had an obvious decreasing tendency in the upper and middle basin, while they had an obvious increasing tendency in the lower basin. CWD almost decreased over the whole basin, and decreased significantly in a small part of the lower basin. The temporal changes of the typical precipitation indices may confirm the possible increasing tendency for occurrence of drier climate and even drought events in the downstream of Jinsha River basin.

Evaluation and Analysis of Grid Precipitation Fusion Products in Jinsha River Basin Based on China Meteorological Assimilation Datasets for the SWAT Model

“…As the rainfall station data in China were corrected over the entire coverage range of CMADS, the correction results of the precipitation data from the Jinsha River Basin during this period improved. The mean annual precipitation totals for the rainy season and dry season of the Jinsha River Basin range from 244-886 mm and 12-130 mm, respectively [57]. Since the Jinsha River Basin is characterized by a pronounced vertical gradient, the annual mean precipitation range varies significantly with elevation and climate conditions.…”

Evaluation and Application of Reanalyzed Combined Data under Extreme Climate Conditions: A Case Study of a Typical Flood Event in the Jinsha River

“…Basin research has important strategic significance for future hydropower development and eco-environmental protection [24][25][26][27]. The Jinsha River Basin has a large area and complex underlying conditions and is a relatively sensitive area to climate change [28], and the distribution of meteorological stations within the basin is relatively sparse. In this paper, multiple types of internationally popular re-analysis fusion data were used to study the extreme climates of the Jinsha River Basin in the upper reaches of the Yangtze River.…”