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Impacts of Climatic Factors on Runoff Coefficients in Source Regions of the Huanghe River 被引量:12
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作者 CHEN Liqun LIU Changming +1 位作者 LI Yanping WANG Guoqiang 《Chinese Geographical Science》 SCIE CSCD 2007年第1期47-55,共9页
Runoff coefficients of the source regions of the Huanghe River in 1956-2000 were analyzed in this paper. In the 1990s runoff of Tangnaihai Hydrologic Station of the Huanghe River experienced a serious decrease, which ... Runoff coefficients of the source regions of the Huanghe River in 1956-2000 were analyzed in this paper. In the 1990s runoff of Tangnaihai Hydrologic Station of the Huanghe River experienced a serious decrease, which had attracted considerable attention. Climate changes have important impact on the water resources availability. From the view of water cycling, runoff coefficients are important indexes of water resources in a particular catchment. Kalinin baseflow separation technique was improved based on the characteristics of precipitation and streamflow. After the separation of runoff coefficient (R/P), baseflow coefficient (Br/P) and direct runoff coefficient (Dr/P) were estimated. Statistic analyses were applied to assessing the impact of precipitation and temperature on runoff coefficients (including Dr/P, Br/P and R/P). The results show that in the source regions of the Huanghe River, mean annual baseflow coefficient was higher than mean annual direct runoff coefficient. Annual runoff coefficients were in direct proportion to annual precipitation and in inverse proportion to annual mean temperature. The decrease of runoff coefficients in the 1990s was closely related to the decrease in precipitation and increase in temperature in the same period. Over different sub-basins of the source regions of the Huanghe River, runoff coefficients responded differently to precipitation and temperature. In the area above Jimai Hydrologic Station where annual mean temperature is -3.9℃, temperature is the main factor influencing the runoff coefficients. Runoff coefficients were in inverse relation to temperature, and precipitation had nearly no impact on runoff coefficients. In subbasin between Jimai and Maqu Hydrologic Station Dr/P was mainly affected by precipitation while R/P and Br/P were both significantly influenced by precipitation and temperature. In the area between Maqu and Tangnaihai hydrologic stations all the three runoff coefficients increased with the rising of annual precipitation, while direct runoff coefficient was inversely proportional to temperature. In the source regions of the Huanghe River with the increase of average annual temperature, the impacts of temperature on runoff coefficients become insignificant. 展开更多
关键词 source regions of the huanghe river runoff coefficient PRECIPITATION TEMPERATURE
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RESEARCH ON THE STRATEGY OF COUNTERMEASURES FOR THE HUANGHE RIVER REGULATION AND FLOOD CONTROL
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作者 Zhang Zhenyu and Wang Wenkai(Institute of Geography, Henan Academy of Sciences,Zhengzhou 450052)Zhou Haiyan and Wang Chao(Yellow River Conservancy Commission ,Zhengzhou 450052) 《Natural Disaster Reduction in China》 1996年第4期145-155,共11页
RESEARCH ON THE STRATEGY OF COUNTERMEASURES FOR THE HUANGHE RIVER REGULATION AND FLOOD CONTROLZhangZhenyuand... RESEARCH ON THE STRATEGY OF COUNTERMEASURES FOR THE HUANGHE RIVER REGULATION AND FLOOD CONTROLZhangZhenyuandWangWenkai(Instit... 展开更多
关键词 RESEARCH ON the STRATEGY OF COUNTERMEASURES FOR the huanghe river RE
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The magnetic properties of sediment and sedimentary environment in the Huanghe Delta area after the last glacial maximum 被引量:1
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作者 PENG Jun LI Ping CHEN Hongquan 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2016年第5期113-123,共11页
On the basis of measuring the magnetic parameters of sediment in Core YDZ1, combined with a grain size analysis and Carbon-14 dating, the magnetic properties of sediment and sedimentary environment in the Huanghe(Yel... On the basis of measuring the magnetic parameters of sediment in Core YDZ1, combined with a grain size analysis and Carbon-14 dating, the magnetic properties of sediment and sedimentary environment in the Huanghe(Yellow River) Delta area after the last glacial maximum have been studied. The results show that the ferrimagnetic minerals of a pseudo single domain and multi domain particles dominate the magnetic properties of sediment in Core YDZ1. The imperfect anti ferrimagnetic minerals have more contribution on sediment in a depth of 24.0–22.1 m, and more stable-single domain and pseudo single domain particles exist. The susceptibility of anhysteretic remanent magnetization and the ratio of the susceptibility of anhysteretic remanent magnetization to saturation isothermal remanent magnetization show a decrease trend below depth of 24 m, a marked increase trend in a depth of 24.0–13.5 m, and a rapid decrease at depth of 13.5 m, then a fluctuation trend upward. The above two magnetic parameters and the ratio of the susceptibility of anhysteretic remanent magnetization to the mass susceptibility can be regarded as the proxy indicators for the content of clay(〈4 μm)and the fine-grained size(〈32 μm). The sedimentary environment after the last glacial maximum in the Huanghe Delta area has experienced the fluvial facies, the tidal flat facies, the neritic facies, the pro delta facies, the delta front facies and the floodplain facies. Thickness of the Holocene transgression layer is 10.5 m and the depth of substrate is about 24 m according to the YDZ1 core. The sedimentary dynamic has a variation trend with strongweak-strong, which has been proved by the Flemming triangular schema. 展开更多
关键词 the huanghe(Yellow river Delta magnetic properties sedimentary environment grain size dating
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OXYGEN ISOTOPE COMPOSITIONS OF SEAWATERS IN THE HUANGHAI(YELLOW) SEA AND THE BOHAI SEA 被引量:2
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作者 吴世迎 《Science China Chemistry》 SCIE EI CAS 1991年第3期327-337,共11页
The characteristics of oxygen isotope compositions and distributions of the seawaters inthe Huanghai(Yellow) Sea and the Bohai Sea have been investigated based on δ^(18)O data meas-ured for 608 water samples. By usin... The characteristics of oxygen isotope compositions and distributions of the seawaters inthe Huanghai(Yellow) Sea and the Bohai Sea have been investigated based on δ^(18)O data meas-ured for 608 water samples. By using the property of tracing atoms, the mixing and theinfluencing range of the diluted freshwater of the Huanghe (Yellow) River and the exhibitionof δ^(18)O values in the movements of the Huanghai Sea warm current and its residual flowshave been discussed. Particularly, the regional, vertical, seasonal and tidal changes of the δ^(18)Ovalues of the waters influenced by the Huanghe River have also been studied. A beneficialexploration was thus made for the application of stable isotope to the physical oceanography. 展开更多
关键词 Huanghai (Yellow) Sea Bohai Sea flushing freshwater of the huanghe (Yellow) river change in δ_(18)O values
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