Runoff variation and its attribution analysis in the typical basin of Loess Plateau at multiple temporal and spatial scales

IF 4.7 2区地球科学 Q1 WATER RESOURCES Journal of Hydrology-Regional Studies Pub Date : 2024-09-10 DOI:10.1016/j.ejrh.2024.101963

Kaixin Jiang , Shuhong Mo , Mingkang Chen , Kunxia Yu , Jingyu Lyu , Peng Li , Zhanbin Li

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Abstract

Study region

Dali River Basin, a typical basin on the Loess Plateau (LP) in China

Study focus

The LP has undergone extensive ecological management in recent decades, significantly altering runoff in the region. For more scientific management of basins, it is useful to study runoff variations at multiple scales quantitatively. Dali River Basin (DRB) was used as the model basin. The impacts of climate change (CC) and human activity (HA) were quantitatively analyzed based on the features of runoff changes at multiple scales using observed hydrological data from to 1960–2020. The characteristics of potential factors influencing HA were further analyzed.

New hydrological insight for the region

The study showed that basin runoff was mainly concentrated during May-October. Spatially, most of the runoff originated from the middle and lower reaches, with little change in the upper reaches. Both CC and HA affected runoff variation, but their effects shifted from upstream to downstream. Apart from the upper reaches, HA was dominant in summer and autumn, whereas CC was dominant in spring and winter. Changes in runoff might be caused by temporal and spatial differences in HA, such as converting cultivated land into forests and grasslands, increasing NDVI, and constructing dams. This analysis of runoff variations at multiple temporal and spatial scales in a representative basin provides a reliable reference for the ecological management of the LP.

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黄土高原典型盆地多时空尺度的径流变化及其归因分析

研究区域中国黄土高原（Loess Plateau，LP）上的典型流域--大理河流域（Dali River Basin）研究重点近几十年来，黄土高原经历了广泛的生态治理，极大地改变了该地区的径流。为了更科学地管理流域，定量研究多个尺度的径流变化是非常有用的。大理河流域（DRB）被用作示范流域。利用 1960-2020 年的观测水文数据，根据多尺度径流变化特征，定量分析了气候变化（CC）和人类活动（HA）的影响。研究表明，流域径流主要集中在 5-10 月间。从空间上看，大部分径流来自中下游，上游变化不大。CC和HA都会影响径流的变化，但其影响从上游向下游转移。除上游外，HA 在夏季和秋季占主导地位，而 CC 则在春季和冬季占主导地位。径流的变化可能是由 HA 的时空差异引起的，如将耕地转化为森林和草地、增加 NDVI 和修建水坝等。对代表性流域多时空尺度径流变化的分析为 LP 的生态管理提供了可靠的参考。

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.