Subjects: Geosciences >> Hydrology submitted time 2023-03-14 Cooperative journals: 《干旱区地理》
Abstract： In arid areas，snowmelt is the main source of water resource formation. Therefore, the formation, transformation and utilization of snow resources are important research topics on the development and utilization of water resources in Xinjiang, China. Further, hydrological model is a key to determine the formation and transformation of water resources. This study uses the field experimental area of Tianshan Snow Station, Chinese Academy of Sciences, as the experimental area. The meteorological data and snowmelt amount were adopted as the independent and dependent variables. A snowmelt model based on temperature change is studied, and a singlefactor simple model is calibrated and validated. Simultaneously, the variation law of snowmelt in the experimental area for many years and the response process of snowmelt to temperature are analyzed. The results indicate that snowmelt still occurs in winter in certain low- temperature ranges. In the study area of Tianshan Mountains, the critical value of daily average temperature of snowmelt is approximately -7 ℃. When the temperature is lower than -7 ℃, snowmelt is basically suspended, reflecting the characteristics of snowmelt in arid areas. In terms of the model, a single factor simple snowmelt model based on temperature exhibits good performance in simulating snowmelt in mountainous areas. During the calibration period (2016—2020), the correlation parameters of Bias, MAE, RMSE, NSE and R2 between the observed and simulated snowmelt values were -0.037, 0.367, 0.482, 0.870, and 0.876 respectively. The values of validation period were -0.210, 0.292, 0.577, 0.845, and 0.811, respectively. The simulation results and correlation coefficients during the validation period indicate that the simulated value of the model has good consistency with the measured value. The advantage is that the amount of snowmelt in the basin can be estimated through the available meteorological data. The results provide a relatively simple algorithm for snowmelt calculation in arid areas and a simple and effective snowmelt submodule for a hydrological model. This study has an important reference value for understanding the change law of snowmelt and the simulation and prediction of snowmelt runoff in subsequent studies
Subjects: Geosciences >> Hydrology submitted time 2022-10-21 Cooperative journals: 《干旱区地理》
Abstract：流域生态基流是河流生态系统健康稳定的关键，以新疆尼雅河流域为研究区域，根据民丰 县气象站19582018年的气象数据与尼雅河4个水文监测断面19782018年的水文数据，运用趋 势拟合、Tennant法、相关性分析和回归模型等分析流域气候变化、确定生态基流并探究其时空分异 与保证率变化，揭示生态基流对气候变化的响应。结果表明：61 a来流域气温以0.22 ℃(10a)-1的 速度增加，年降水量以3.8 mm(10a)-1的速度增加；尼雅水库、八一八渠首、尼雅水文站和尼雅渠首 的年生态基流推荐值分别为：1.989 m3s-1、2.188 m3s-1、1.755 m3s-1、1.702 m3s-1；生态基流年际最 大值出现在2010年，最小值在1980年，年内最大值在7月，最小值在1月或12月；空间上表现为上 游高下游低，以八一八渠首处最高，尼雅渠首处最低；各站多年平均生态基流保证率分别为：50%、 45%、50%、45%，且表现出汛期明显高于非汛期；逐年、逐月生态基流与气温、降水量均在0.01水平 上显著相关，但在春夏季对气温敏感，秋冬季对降水量敏感，各水文监测断面的回归模型耦合效果 相似，流域整体回归方程R2=0.365，且生态基流对气候变化响应具有整体性和衰减性。研究结果可 为尼雅河流域生态调水和水生态修复提供参考。
Hits
Hits
Downloads
Comment