Subjects: Geosciences >> Geography submitted time 2024-07-04 Cooperative journals: 《干旱区研究》
Abstract： Based on the measured annual and monthly runoff data of Huining, Guochengyi and Jingyuan stations in the main stream of Zuli River from 1957 to 2021, the variation characteristics and driving factors of runoff at different time scales in Zuli River Basin were analyzed by linear tendency estimation, Mann-Kendall test and wavelet analysis. The results showed that: which are mainly influenced by human activities and climatic factors. (1) The runoff of the main stream of the Zuli River showed a decreasing trend from 1957 to 2021, and the runoff has decreased by 52.9% over the past 30 years. (2) The measured annual runoff of the three hydrological stations of Huining, Guochengyi, and Jingyuan underwent abrupt changes in 1992, 1984, and 1994, respectively. (3)Runoff and precipitation showed similar cycles of abundant and low state at the three stations of the main stream of Zuli River. The analysis results show that the reduction of measured annual runoff in the main stream of the Zuli River is mainly affected by human activities such as soil and water conservation measures, followed by climatic factors such as the reduction of precipitation, of which human activities and climate change contribute to the reduction of runoff by 74.47% and 25.53%, respectively.
Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： The annual and monthly precipitation data from five hydrological stations in the Shule River Basinfrom 1956 to 2020, were analyzed using linear tendency, sliding average, cumulative anomaly, Mann- Kendallmutation test, wavelet analysis, and other methods. The interannual variation process for precipitation in theShule River Basin and its variation characteristics, such as mutability, trend, periodicity, persistence,heterogeneity, and concentration, were evaluated. The results show that the annual precipitation at each station inthe Shule River Basin showed different increasing trends, and the precipitation at each station showed differentmutation characteristics. Over the previous 60 years, precipitation in the entire basin presents a relatively unevendistribution on the time scale, and the precipitation in the upstream area is more than that in the downstream.Specifically, the annual precipitation at Changmabao and Dangchengwan stations showed obvious increasingtrends, while the increasing trend at Panjiazhuang station and Shuangtabao and Danghe reservoir stations was notobvious. The analysis indicates that precipitation in the basin will continue to show an increasing trend in thecoming period.
Subjects: Geosciences >> Hydrology submitted time 2022-12-20 Cooperative journals: 《干旱区研究》
Abstract：
A quantitative analysis of runoff variation characteristics is the basis for finding out its impact mechanism, and it is also an important basis for accurately evaluating water resources. This study used eight annual distribution indexes, such as the Gini coefficient and Lorentz asymmetry coefficient, combined with the M-K test、R/S analysis, and other mathematical statistics methods, to comprehensively analyze the process of the runoff of the upper reaches of the Shule River from the annual and interannual levels. The results showed that the following: (1) during the year, a unimodal distribution was shown, which was mainly concentrated in the flood season concentration degree (D), inhomogeneous coefficient (Cv), Gini coefficient (GI), relative change range (Cm) decreased respectively at the rate of - 1.053 · (10a)- 1 , - 0.015 · (10a)- 1 , - 0.009 · (10a)- 1 ,- 0.643 · (10a)- 1 , complete adjustment coefficient (Cr), Lorentz asymmetry coefficient (S), concentration period (Cn) all decreased at the rate of -0.006·(10a)-1 . The distribution tended to be uniform gradually according to the changing trend of its characteristic index during the year. (2) The annual runoff showed an overall increasing trend, but an abrupt change occurred in 1997, and the average annual runoff afterward increased by 59% compared before the change. (3) The runoff generally showed an upward trend in all four seasons, among which the trend rate was the greatest in the summer and the smallest in the winter. After the abrupt change in the 1990s, the average runoff increased significantly compared to before the abrupt change, and the change range was in the following order: autumn (76%) > winter (74%) > summer (58%) > spring (45%). (4) The annual and seasonal runoff in the upper reaches of the Shule River had multiple time characteristic scale periods, and the first major cycle were both 56 years. (5) According to the predicted runoff from 2022 to 2024, it was found that the runoff of the upper reaches of the Shule River will continue to increase in the next three years. These results provided a scientific basis for accurately grasping the runoff variation laws and characteristics of the upper reaches of the Shule River and had certain guiding significance for the sustainable development and utilization of water resources in the Shule River Basin and the study of the runoff variation laws in inland river basins.
Subjects: Geosciences >> Geography submitted time 2021-03-03 Cooperative journals: 《干旱区地理》
Abstract： 河川径流还现计算是准确反映区域水资源状况的基础，同时也是水资源规划和决策的重 要依据。选取甘肃省洮河流域李家村、红旗 2 个代表水文站长系列径流资料作为基础数据，在还原 计算的础上，对洮河流域径流进行还现计算，同时对径流变化特征进行研究。结果表明：1956— 2016 年洮河流域李家村、红旗多年平均实测径流量分别为 39.52×108 m3、44.66×108 m3，还原后多年 平均天然径流量分别为 39.69×108 m3、46.11×108 m3，多年平均还原水量分别为 0.17×108 m3、1.45×108 m3，2 站消耗水量主要用于农业灌溉；2 站天然径流突变趋势基本一致，突变点均为 1990 年；李家 村、红旗站径流多年平均天然径流量修正还现后分别为 31.76×108 m3、38.77×108 m3，减少径流量分 别为 7.93×108 m3、7.04×108 m3，分别减少 20%、15%；还现后李家村站年径流呈现略微增加趋势，而红 旗站年径流量呈现略微减小趋势；径流量呈现 20 世纪 50 年代和 70 年代—21 世纪 00 年代低于多年 平均值，21 世纪 10 年代高于平均值和不同丰、平、枯状态的年代际特证。研究结果为流域水资源调 查评价提供基础支撑，对促进流域水资源高效利用和优化配置，指导区域水资源综合管理与社会 经济发展具有重要作用。
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