scholarly journals Detection of Abrupt Changes in Runoff in the Weihe River Basin

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Yanling Li ◽  
Jianxia Chang ◽  
Zhiliang Wang ◽  
Huiling Li
Keyword(s):  
River Basin ◽  
Management Strategies ◽  
Hydrological Regime ◽  
Annual Runoff ◽  
Intrinsic Mode Functions ◽  
Data Set ◽  
Time Frequency ◽  
Abrupt Changes ◽  
Weihe River ◽  
Weihe River Basin

Climate change and human activities are two major driving factors for variations in hydrological patterns globally, and it is of significant importance to distinguish their effects on the change of hydrological regime in order to formulate robust water management strategies. Hilbert-Huang transform-based time-frequency analysis is employed in this study to detect abrupt changes and periods of the runoff at five hydrological stations in the Weihe River Basin, China, from 1951 to 2010. The key part of the method is the empirical decomposition mode with which any complicated data set can be decomposed into small number of intrinsic mode functions that admit well adaptive Hilbert transforms. Moreover, an attempt has been made to find out the specific reason for the abrupt point at the five hydrological stations in the Weihe River Basin. The results are presented as follows: (1) annual runoff significantly declined in the basin in intervals of 8~15 years; (2) abrupt changes occurred in 1971, 1982, and 1994 at Huaxian, 1972 and 1982 at Xianyang, 1992 at Zhangjiashan, 1990 at Zhuangtou, and 1984 at Beidao; (3) changes were more frequent and complex in the mainstream and downstream reaches than in tributaries and upstream reaches, respectively.

scholarly journals Hybrid method for assessing the multi-scale periodic characteristics of the precipitation–runoff relationship: a case study in the Weihe River basin, China

2016 ◽  
Vol 8 (1) ◽  
pp. 62-77 ◽  
Author(s):  
Aijun Guo ◽  
Jianxia Chang ◽  
Qiang Huang ◽  
Yimin Wang ◽  
Dengfeng Liu ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
River Basin ◽  
Hybrid Method ◽  
Hydrological Cycle ◽  
Monthly Precipitation ◽  
Time Frequency ◽  
Multi Scale ◽  
Frequency Domains ◽  
Weihe River ◽  
Weihe River Basin

Fully elucidating the precipitation–runoff relationship (PRR) is of great significance for better water resources planning and management and understanding hydrological cycle processes. For investigating the multi-scale PRR variability in the Weihe River basin in 1960–2010, a new hybrid method is proposed in which ensemble empirical mode decomposition (EEMD) and cross wavelet transform and wavelet transform coherence are used in combination. With the application of mutual information entropy, monthly precipitation and runoff are decomposed into two parts: high- (HFC) and low-frequency components (LFC). The results show that HFCs are characterized by inter- and intra-annual variations in precipitation and runoff, whereas LFCs display approximately two-year periodicity and contain abundant abnormal information of the raw data. Therefore, the PRR between HFCs exhibited significant correlations at the 95% confidence level over the whole time period. However, the correlations of the PRR between LFCs are not significant for many of the time-frequency domains. Additionally, the phase relations are disordered in these time-frequency domains, and no certain trend in phase angle variations can be identified. Through comparative analysis of the anthropogenic activities and climatic events with PRR variations, it can be concluded that the hybrid method can efficiently capture the PRR in various time-frequency domains.

scholarly journals Variations in the precipitation–runoff relationship of the Weihe River Basin

2016 ◽  
Vol 48 (1) ◽  
pp. 295-310 ◽  
Author(s):  
Aijun Guo ◽  
Jianxia Chang ◽  
Dengfeng Liu ◽  
Yimin Wang ◽  
Qiang Huang ◽  
...  
Keyword(s):  
River Basin ◽  
Human Activities ◽  
Driving Forces ◽  
Potential Evapotranspiration ◽  
Annual Runoff ◽  
Change Points ◽  
Archimedean Copulas ◽  
Significance Level ◽  
Weihe River ◽  
Weihe River Basin

The main goal of this study is to introduce the Archimedean copulas, which overcome the low accuracy and subjective nature of the traditional double mass curve method, to investigate the precipitation–runoff relationship (PRR) and detect change points in the Weihe River Basin (WRB). With the construction of a joint distribution between precipitation and runoff by the Archimedean copulas, a statistical variable considering the distribution parameter was estimated to judge the change point of the PRR. The results show that: (1) annual precipitation and runoff present decreasing trends that are significant and insignificant, respectively, at the 95% significance level, while annual potential evapotranspiration (PET) increases slightly; (2) change points of the PRR occurred in 1971 and 1994; (3) the annual runoff changed more dramatically than precipitation during the periods from 1972 to 1994 and 1995 to 2010 compared with 1960–1971, which indicates that in addition to precipitation, there are some other non-precipitation factors that are responsible for the change in the PRR; and (4) the contributions to runoff from human activities declined from 1972 to 1994 (84.15%) and 1995 to 2010 (57.16%). These results suggest that human activities (e.g., irrigation, reservoirs, water-and-soil conservation) were the primary driving forces leading to changes in the PRR in the WRB.

scholarly journals Analyzing the Impacts of Climate Variability and Land Surface Changes on the Annual Water–Energy Balance in the Weihe River Basin of China

Water ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1792 ◽  
Author(s):  
Wenjia Deng ◽  
Jinxi Song ◽  
Hua Bai ◽  
Yi He ◽  
Miao Yu ◽  
...  
Keyword(s):  
Resource Management ◽  
Climate Variability ◽  
River Basin ◽  
Land Surface ◽  
Water Resource Management ◽  
Abrupt Change ◽  
Annual Runoff ◽  
Weihe River ◽  
Weihe River Basin ◽  
Surface Changes

The serious soil erosion problems and decreased runoff of the Loess Plateau may aggravate the shortage of its local water resources. Understanding the spatiotemporal influences on runoff changes is important for water resource management. Here, we study this in the largest tributary of the Yellow River, the Weihe River Basin. Data from four hydrological stations (Lin Jia Cun (LJC), Xian Yang (XY), Lin Tong (LT), and Hua Xian (HX)) and 10 meteorological stations from 1961–2014 were used to analyze changes in annual runoff. The Mann–Kendall test and Pettitt abrupt change point test diagnosed variations in runoff in the Weihe River basin; the time periods before and after abrupt change points are the base period (period I) and change period (period II), respectively. Within the Budyko framework, the catchment properties (ω in Fu’s equation) represent land surface changes; climate variability comprises precipitation (P) and potential evapotranspiration (ET0). All the stations showed a reduction in annual runoff during the recording period, of which 22.66% to 50.42% was accounted for by land surface change and 1.97% to 53.32% by climate variability. In the Weihe River basin, land surface changes drive runoff variation in LT and climate variability drives it in LJC, XY, and HX. The contribution of land surface changes to runoff reduction in period I was less than that in period II, indicating that changes in human activity further decreased runoff. Therefore, this study offers a scientific basis for understanding runoff trends and driving forces, providing an important reference for social development, ecological construction, and water resource management.

Elevation Cluster Dataset Covering the Weihe River Basin

GCdataPR ◽  
2020 ◽  
Author(s):  
Fengli ZHA ◽  
Chuang LIU ◽  
Ruixiang SHI
Keyword(s):  
River Basin ◽  
Weihe River ◽  
Weihe River Basin

Boundary Data of the Weihe River Basin, China

GCdataPR ◽  
2020 ◽  
Author(s):  
Yuefei HUANG ◽  
Tiejian LI ◽  
Enze LV ◽  
Jiaye LI ◽  
Rui BAI ◽  
...  
Keyword(s):  
River Basin ◽  
Boundary Data ◽  
Weihe River ◽  
Weihe River Basin

scholarly journals Effect of Hyporheic Exchange on Macroinvertebrate Community in the Weihe River Basin, China

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 457
Author(s):  
Qidong Lin ◽  
Jinxi Song ◽  
Carlo Gualtieri ◽  
Dandong Cheng ◽  
Ping Su ◽  
...  
Keyword(s):  
River Basin ◽  
Transport Processes ◽  
Macroinvertebrate Community ◽  
Hyporheic Exchange ◽  
Macroinvertebrate Communities ◽  
Fine Grained ◽  
River Bed ◽  
Weihe River ◽  
Abundance And Diversity ◽  
Weihe River Basin

The effect of hyporheic exchange on macroinvertebrates is a significant topic in ecohydraulics. A field study was conducted during May and June 2017 to investigate the impacts of magnitude and patterns of hyporheic exchange on the sediment macroinvertebrate community in the Weihe River basin. The results demonstrate that upwelling flows cause resuspension of riverbed sediment, increasing the proportion of swimmer groups (such as Baetidae) in the macroinvertebrate community. However, large resuspension of river bed sediment results in a reduced abundance of macroinvertebrates. By controlling the transport processes of dissolved oxygen (DO), dissolved organic carbon (DOC), nutrients, temperature, and different patterns of hyporheic exchange strongly influence the structure of macroinvertebrate communities. Downwelling is more likely to produce rich invertebrate communities than upwelling. The magnitude for the hyporheic flux of 150–200 mm/d was optimal for the macroinvertebrate community in the Weihe River Basin. Above or below this rate results in a decline in community abundance and diversity. We suggest that research is conducted to better understand the effects of hyporheic exchange across bedforms on macroinvertebrate communities. The study supports any activities to preserve the ecological functions and health of rivers dominated by fine-grained sediments.

scholarly journals Contamination Level, Distribution Characteristics, and Ecotoxicity of Tetrabromobisphenol A in Water and Sediment from Weihe River Basin, China

2020 ◽  
Vol 17 (11) ◽  
pp. 3750
Author(s):  
Xueli Wang ◽  
Chenyang Li ◽  
Xiaoyu Yuan ◽  
Shengke Yang
Keyword(s):  
River Basin ◽  
Water Samples ◽  
Mean Value ◽  
Tetrabromobisphenol A ◽  
Pollution Level ◽  
Long Distance ◽  
Water And Sediment ◽  
Local Point ◽  
Weihe River ◽  
Weihe River Basin

Tetrabromobisphenol A (TBBPA) is a brominated flame retardant, which is widely present in the various environmental and biological media. The knowledge on the contamination of TBBPA in Weihe River Basin is still limited. In order to know the pollution level and distribution of tetrabromobisphenol A (TBBPA) in the Weihe River Basin, a total of 34 sediment samples and 36 water samples were collected from the main stream and tributaries of the WeiHe River Basin, and the concentration of TBBPA in the samples was analyzed by high-performance liquid chromatography–electrospray ionization–mass spectrometry (HPLC-ESI-MS). The detection frequency of TBBPA in sediments and water samples was 61.8% and 27.8%, respectively; the TBBPA concentrations in sediments and water samples were in the range of not detected (N.D.)–3.889 ng/g (mean value of 0.283 ng/g) and N.D—12.279 ng/L (mean value of 0.937 ng/L), respectively. Compared with other areas in China, the residues of TBBPA in the Weihe River Basin were at a relatively low level. The spatial distributions of TBBPA in surface sediments and water indicated that the local point-input was their major source. This is related to the proximity of some sampling sites to industrial areas and domestic sewage discharge areas. The insignificant correlation between TBBPA and total organic carbon (TOC) indicated that TBBPA in sediments is not only influenced by TOC but also affected by atmosphere and land input, wet deposition, and long-distance transmission. The potential risks posed by TBBPA in water and sediment were characterized using the risk quotient (RQ) method. The calculated RQ for TBBPA was less than 0.01, showing that the ecological risk due to TBBPA was quite low for aquatic organisms.

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