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5. Quantifying the impacts of climate change and human activities on ecological flow security based on a new framework.

Author

Wang, Hongxiang, Cheng, Siyuan, Bai, Xiangyu, Yuan, Weiqi, Wang, Bing, Hong, Fengtian, and Guo, Wenxian

Subjects
WATER management, CLIMATE change models, PROBABILITY density function, HYDROLOGICAL stations, ECOSYSTEM management
Abstract

Climate change and human activities combine to alter river hydrology, thereby threatening the health of river ecosystems. Quantifying the impacts of climate change and human activities on ecological flow assurance is essential for water resource management and river ecological protection. However, fewer studies quantify the impacts of climate change and human activities on ecological flow assurance based on a complete set of frameworks. The present study introduces an integrated assessment framework designed to quantify the impacts of climate change and human activities on ecological flow security. The framework includes the following steps: (1) natural river runoff reconstruction utilizing a semi‐distributed hydrological model (SWAT), (2) calculation of the most suitable ecological stream flow of the watershed ecosystem by using the non‐parametric kernel density estimation method, (3) calculation of the safety and security levels under minimum ecological flow and appropriate ecological flow conditions in the watershed and (4) quantification of the influences of climate change and human activities on the security of ecological flow in the watershed through the application of a quantitative attribution method. The impact of climate change and human activities on the ecological flow assurance level was analysed using three hydrological stations in Xiangtan, Hengyang and Laobutou, which are the main tributaries of the Xiangjiang River Basin, as a case study. The findings indicated a substantial decrease in ecological flow assurance levels across the basin during the period of human impact (1991–2019). The quantitative assessment results suggest that human activities predominantly drive the degradation of ecological flow assurance throughout the period of human impact, accounting for 57.05% of the total impact. Extensive gradient reservoir scheduling and anthropogenic water withdrawals were the main factors contributing to the degradation of ecological flow assurance in the study basin. The methodology and findings presented in this study offer insights into the evolutionary characteristics and driving forces behind ecological flow security in a dynamic environment. Furthermore, they establish a scientific foundation for local water resource management and river ecosystem protection. [ABSTRACT FROM AUTHOR]

Published
2024
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11. The ecological–hydrological regime of the Han River basin under changing conditions: The coupled influence of human activities and climate change.

Author

Wang, Hongxiang, Yuan, Weiqi, Yang, Huan, Hong, Fengtian, Yang, Kefei, and Guo, Wenxian

Subjects
WATERSHEDS, REGRESSION analysis, FACTOR analysis, ECOHYDROLOGY, CLIMATE change
Abstract

Because of the confluence of human activities and climate change, the hydrological regime in the Han River basin has substantially evolved, necessitating a multi‐faceted, quantitative analysis of the causative factors. Employing cross‐wavelet analysis, we examined nonlinear relationships between runoff and meteorological variables. Additionally, we assessed hydrological indicators via the IHA index and RVA, then quantified the drivers of runoff variations across different time scales using the Budyko hypothesis and a Generalized Regression Neural Network (GRNN) model. The findings reveal the presence of sustained resonance periods within the climate‐runoff system, notably concentrated in 9‐ to 15‐month intervals during the years 1985–1994, 1995–2012, and 2014–2018, with a confidence level of 95%. Overall, the basin exhibited moderate change (41.66%), with 15 indicators displaying varying degrees of moderate to high transformation. These shifts underscore significant ecosystem transformations. The influence of driving factors on runoff varies across temporal scales. On an annual scale, human activities predominantly shape runoff changes (52.35%), while meteorological factors contribute significantly (47.65%). Conversely, at the monthly scale, climate change emerges as the dominant influence on runoff patterns in June and September, with human activities maintaining a principal role in other months, notably exceeding 90% even in November. [ABSTRACT FROM AUTHOR]

Published
2024
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22. An Effective Optical Component to Increase the Illumination Uniformity of Extended LED Light Source

Author

Tang, Yonghua, Yuan, Weiqi, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Sang, Haifeng, editor, Zhou, Jie, editor, Wang, Yunhong, editor, and Yuan, Weiqi, editor

Published
2014
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23. Pupil Contour Extraction Method of Anti-light Spot Interference for Iris Image Captured in Visible Light

Author

Yu, Xia, Song, Jian, Yuan, Weiqi, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Sang, Haifeng, editor, Zhou, Jie, editor, Wang, Yunhong, editor, and Yuan, Weiqi, editor

Published
2014
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24. Extraction and Analysis of Texture Information of the Iris Intestinal Loop

Author

Yuan, Weiqi, Huang, Jing, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Sang, Haifeng, editor, Zhou, Jie, editor, Wang, Yunhong, editor, and Yuan, Weiqi, editor

Published
2014
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25. Corneal Arcus Segmentation Method in Eyes Opened Naturally

Author

Chang, Le, Yuan, Weiqi, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, You, Zhisheng, editor, Zhou, Jie, editor, Wang, Yunhong, editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Zheng, Weishi, editor, Feng, Jianjiang, editor, and Zhao, Qijun, editor

Published
2016
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26. Extraction of the Iris Collarette Based on Constraint Interruption CV Model

Author

Huang, Jing, Yuan, Weiqi, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, You, Zhisheng, editor, Zhou, Jie, editor, Wang, Yunhong, editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Zheng, Weishi, editor, Feng, Jianjiang, editor, and Zhao, Qijun, editor

Published
2016
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27. An Accurate Iris Segmentation Method Based on Union-Find-Set

Author

Zhu, Lijun, Yuan, Weiqi, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, You, Zhisheng, editor, Zhou, Jie, editor, Wang, Yunhong, editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Zheng, Weishi, editor, Feng, Jianjiang, editor, and Zhao, Qijun, editor

Published
2016
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29. The K-F Ring Detection Method Based on Image Analysis

Author

Chang, Le, Yuan, Weiqi, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Yang, Jinfeng, editor, Yang, Jucheng, editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Zheng, Weishi, editor, and Feng, Jianjiang, editor

Published
2015
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30. Iris Cracks Detection Method Based on Minimum Local Gray Value and Dilating Window of Regional Mean Gray Value

Author

Zhang, Bo, Yuan, Weiqi, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Yang, Jinfeng, editor, Yang, Jucheng, editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Zheng, Weishi, editor, and Feng, Jianjiang, editor

Published
2015
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31. Extraction of Texture Primitive of the Iris Intestinal Loop

Author

Huang, Jing, Yuan, Weiqi, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Yang, Jinfeng, editor, Yang, Jucheng, editor, Sun, Zhenan, editor, Shan, Shiguang, editor, Zheng, Weishi, editor, and Feng, Jianjiang, editor

Published
2015
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37. The Research of Multi-spectral Hand Texture Fusion Method under a Non-constraint Condition

Author

Yuan, Weiqi, Tang, Yonghua, Fang, Ting, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Zheng, Wei-Shi, editor, Sun, Zhenan, editor, Wang, Yunhong, editor, Chen, Xilin, editor, Yuen, Pong C., editor, and Lai, Jianhuang, editor

Published
2012
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38. The Location Method of the Main Hand-Shape Feature Points

Author

Yuan, Weiqi, Jing, Lantao, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Zheng, Wei-Shi, editor, Sun, Zhenan, editor, Wang, Yunhong, editor, Chen, Xilin, editor, Yuen, Pong C., editor, and Lai, Jianhuang, editor

Published
2012
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39. Research of Palmprint Recognition Based on 2DPCA

Author

Sang, Haifeng, Yuan, Weiqi, Zhang, Zhijia, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Yu, Wen, editor, He, Haibo, editor, and Zhang, Nian, editor

Published
2009
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40. An Accurate and Fast Iris Location Method Based on the Features of Human Eyes

Author

Yuan, Weiqi, Xu, Lu, Lin, Zhonghua, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Wang, Lipo, editor, and Jin, Yaochu, editor

Published
2005
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