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The Ma.ine Dyna.ics a.d Cha.ging Trend off the Modern Yellow River Mouth

Journa. of Ocea. University of China 2015年第3期14卷 433-445页

作者： Wa.G Na. LI Gua.gxue XU Jisha.g QIa. Lulu dada olusegun a. ZHOU Chunya. College of Ma.ine Geosciences Ocean University of China Key La.ora.ory of Subma.ine Sciences a.d Prospecting Techniques MOE Ocean University of China Depa.tment of Ma.ine Science a.d Technology Federal University of Technology Sta.e Key La.ora.ory of Hydrology-Wa.er Resources a.d Hydra.lic Engineering Hohai University

Topogra.hy a.ound the Yellow River mouth ha. cha.ged grea.ly in recent yea.s, but studies on the current sta.e of ma. rine dyna.ics off the Yellow River mouth a.e rela.ively sca.ce. This pa.er uses a.two-dimension numerica. model （MIKE 21） to revea. the tida. a.d wa.e dyna.ics in 2012, a.d conducts compa.a.ive a.a.ysis of the cha.ges from 1996 to 2012. The results show tha. M2 a.phidromic point moved southea.twa.d by 11 kin. It further revea.s tha. the tides a.ound the Yellow River mouth a.e rela.ively sta.le due to the sma.l va.ia.ions in the tida. constituents. Over the study period, there is no noticea.le cha.ge in the distribution of tida. types a.d tida. ra.ge, a.d the mea. tida. ra.ge off the river mouth during the period studied is 0.5-1.1 m. However, the tida. currents cha.ged grea.ly due to la.ge cha.ge in topogra.hy. It is observed tha. the a.ea.with strong tida. currents shifted from the old river mouth （1976-1996） to the modem river mouth （1996-present）. While the tida. current speeds decrea.ed continua.ly off the old river mouth, they increa.ed off the modem river mouth. The Ma.imum Tida. Current Speed （MTCS） rea.hed 1.4 m s-1, a.d the ma.imum current speed of 50-yea. return period rea.hed 2.8 m s-1. Wa.es a.so cha.ged grea.ly due to cha.ge in topogra.hy. The significa.t wa.e height （H1/3） of 50-yea. return period cha.ged proportiona.ely with the wa.er depth, a.d the ra.io of Hi/3 to depth being 0.4-0.6. H1/3 of the 50-yea. return period in erosion zone increa.ed continua.ly with increa.ing wa.er depth, a.d the ra.e of cha.ge va.ied between 0.06 a.d 0.07myr-1. Ba.ed on the results of this study, we infer tha. in the future, the modem river mouth will protrude gra.ua.ly northwa.d, while the erosion zone, comprising the old river mouth a.d a.ea.between the modern river mouth a.d the old river mouth （Intermedia.e region） will continue to erode. a. the modem river mouth protrudes towa.ds the sea. there will be a.gra.ua. increa.e in the current speed a.d dec

关键词： Yellow River mouth tida. dyna.ics wa.e numerica. simula.ion cha.ge trend 50-yea. return period

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Sediment records of environmenta. cha.ges in the south end of the Zhejia.g-Fujia. coa.ta. mud a.ea.during the pa.t 100 yea.s

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Chinese Journa. of Ocea.ology a.d Limnology 2014年第4期32卷 899-908页

作者：王琳淼李广雪高飞刘玲刘勇 dada olusegun A College of Ma.ine Geoscience Ocean University of China Key La.ora.ory of Subma.ine a.d Prospecting Techniques Ocean University of China Depa.tment of Ma.ine Science a.d Technology Federal University of Technology

Previous studies ca.ried out in the Ea.t China.Sea.（ECS） mud a.ea.focused on long-term environmenta. cha.ges in sedimenta.y records during the Holoeene, especia.ly during the mid-Holocene high-sta.d wa.er levels period. These results indica.e tha. sensitive gra.n size groups ca. be used a. a.sedimenta.y proxy to reconstruct the evolution of the Ea.t a.ia. Winter Monsoon （Ea.M）. The studies ha.e been ca.ried out ma.nly in the northern a.d middle portions of the Zhejia.g-Fujia. coa.ta. mud, however, simila. resea.ch in the southern portion a.d the compa.ison between sedimenta.y proxy a.d modern mea.ured da.a.of Ea.M a.e la.king. In this pa.er, we focused on a.sedimenta.y record of the pa.t 100 yea.s with a. enha.ced resolution of 1.8 yea.s. Investiga.ions of the southern end of the Zhejia.g-Fujia. coa.ta. mud a.ea.were conducted on the ba.is of 21~Pb chronology, gra.n-size a.a.ysis a.d chemica. element a.a.ysis. The correspondence between the mea. gra.n size （Mz） of sediment sensitive gra.n size a.d the mea.ured Ea.M wa. confirmed for the first time. We found tha. during the recent 100 yea.s, the va.ia.ion of the mea. gra.n size of the sensitive popula.ion in the southern portion of the Zhejia.g-Fujia. mud wa. ma.nly controlled by the Ea.M intensity cha.ges; a.d not directly rela.ed to cha.ges in the sediment discha.ge from Da.ong sta.ion of the Cha.gjia.g River （DTSD）. Fina.ly, recent cha.ges in the content of hea.y meta.s in study a.ea.reflect the impa.t of huma. a.tivities on the environment.

关键词： Zhejia.g-Fujia. coa.t sedimenta.y record environmenta. cha.ges Ea.t a.ia. Winter Monsoon(Ea.M)

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a.geomorphologica. response of bea.hes to Typhoon Mea.i in the ea.tern Sha.dong Peninsula.in China

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a.ta.Ocea.ologica.Sinica 2015年第9期34卷 126-135页

作者： DING Dong Ya.G Jicha. LI Gua.gxue dada olusegun a.GONG Lixin Wa.G Na. Wa.G Xia.gdong ZHa.G Bin College of Ma.ine Geosciences Ocean University of China Na.iona. Deep Sea.Center State Oceanic Administration Depa.tment of Ma.ine Science a.d Technology Federal University of Technology

Eight representa.ive bea.h profiles on the ea.tern coa.t of the Sha.dong Peninsula.a.e observed a.d mea.ured in 2011 a.d 2012 to determine the coa.ta. processes under the lower tropica. wind speed condition a.d the bea.h response to a.d recovery from the tropica. storm Mea.i in a.ra.e typhoon region. The results show tha. it is the enha.cement a.d directiona. cha.ge of cross-shore a.d longshore sediment tra.sports ca.sed by Mea.i tha. lea.s to the bea.h morphologica. cha.ges, a.d most of the sediment tra.sports occur during the pre-Mea.i la.ding pha.e. The erosiona. sca.p forma.ion a.d the berm or bea.h fa.e erosion a.e the ma.n geomorphologica. responses of the bea.hes to the storm. The storm cha.a.teristics a.e more importa.t tha. the bea.h sha.es in the storm response process of the bea.hes on Sha.dong Peninsula. The typhoon is a.fortuitous strong dyna.ic event, a.d the effect on the dissipa.ive bea.h is more obvious tha. it is on the reflective bea.h in the study region. Furthermore, the bea.h trend is the ma.n fa.tor tha. controlls the storm effect intensity, a.d it is a.so closely rela.ed to the recovery of the bea.h profiles.

关键词： bea.h typhoon geomorphologica. response Sha.dong Peninsula.in China

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Effects of soil physica. properties on soil loss due to ma.ua. ya. ha.vesting under a.sa.dy loa. environment

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Interna.iona. Soil a.d Wa.er Conserva.ion Resea.ch 2016年第2期4卷 121-125页

作者： Pius Olufemi olusegun dada olusegun Ra.heed a.eya.ju Ola.emi Johnson a.eosun Johnson Ka.ode a.ewumi Depa.tment of a.ricultura. Engineering Federal University of AgricultureAbeokuta P.M.B.2240AbeokutaOgun StateNigeria

Soil degra.a.ion is a.growing problem worldwide beca.se it reduces the fertile top la.er of the soil a.a.la.le for food production a.d one such degra.a.ive a.tion is soil erosion due to the ha.vesting of *** loss due to crop ha.vesting with pa.ticula. reference to ya. tubers ha. not been qua.tified globa.ly despite the fa.t tha. ya. is a.ma.or sta.le food consumed worldwide a.d it is preva.ent in ma.y pa.ts of *** ya.s in our environment is usua.ly done with the soil a.ta.hed to the ya.s due to the fa.t tha. fa.mers do not wa.t a.ditiona. work of removing soil a.ta.hed to the *** study investiga.es the soil physica. properties tha. influence soil loss due to ya. ha.vesting in a.eokuta.South-Western Nigeria.a.d to a.sess the qua.tity of soil loss due to ya. *** on representa.ive sa.pling a.ea.per loca.ion,ya. tubers were ha.vested ma.ua.ly within the entire ya. fa.mla.d from October to December *** weight,net weight a.d the a.ount of soil a.hering to the ya.s were *** of soil physica. properties such a. soil moisture content,hea. bulk density,inter-hea. bulk density a.d soil texture were investiga.ed with respect to soil *** results showed tha. moisture content ra.ged from 4%to 15%,hea. bulk density ra.ged from 0.93 to 1.29 g cm^(-3) a.d inter-hea. bulk density ra.ged from 1.03 to 1.50 g cm^(-3).They a.l ha. a.positive correla.ion with soil *** pa.ticle size a.a.ysis for Federa. University of a.ricultura.,a.eokuta.FUNa.B)a.d a.a.a.a.revea.ed tha. sa.d content wa.(86.78%a.d 88.32%),cla. content(10.69%a.d 7.6%)a.d silt content,(2.53%a.d 4.08%)*** a.so revea.ed tha. cla. content of the soil positively influenced the tota. soil loss during the ya. *** mea. soil losses in Federa. University of a.riculture,a.eokuta.FUNa.B)a.d a.a.a.a.villa.e ya. fa.ms were 4303 a.d 2125 kg/ha.ha.vest *** study a.so revea.ed tha. soil moisture content a. ha.vesting time a.d cla.

关键词： Hea. bulk density Ma.ua. ya. ha.vesting Soil degra.a.ion Soil loss Soil physica. properties

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Ma.netic properties indica.e the sources of ha.a. sediments in the Ya. Trench,northwest Pa.ific Ocea.

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Journa. of Ocea.ology a.d Limnology 2020年第3期38卷 665-678页

作者： CHEN Yu Ya.G Jicha. dada olusegun a.Ya.G Ya.min LIN Zhen CUI Zhen XU Yue YU Hongjun LIU Ba.hua Institute of Deep Sea.Science a.d Engineering Chinese Academy of ScienceSanya 572000China Na.iona. Deep Sea.Center Ministry of Natural Resources(MNR)Qingdao 266237China Dept.of Ma.ine Science&Technology Federal University of TechnologyAkure 340252Nigeria University of Chinese a.a.emy of Science Beijing 100049China

Ma.netic minera.s in ma.ine sediments a.e often ma.ked by the prima.y na.ura. rema.ent ma.netiza.ion a.d ma.eria. source *** order to understa.d sedimenta.y environment a.d sources of sediments in the a.yss,we studied 126 sa.ples of five bottom surfa.e cores collected by the Jia.long Submersible a. 4000-7000 m in depth during the third sta.e of the China.s 38th Ocea. *** ma.netic properties of the sediments were a.a.yzed using Thermosusceptibility(k-T)curves a.d Da. *** results show tha. the ma.netic minera.s in the sediments of the Ya. Trench a.e ma.nly ma.hemite,a.d the overa.l ma.netic a.d soft ma.netic properties were *** ma.netic pa.ticles of sediments a.e domina.ed by pseudo single doma.ns(PSD)*** ma.n source of sediment is loca.ly-derived ba.a.t debris a.d volca.ic debris,a.d the process of sedimenta.ion is gra.ity-like flow deposition.

关键词： ma.netic property ma.eria. resource ha.a. sediment Ya. Trench

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尼日利亚海侵泥质海岸粘性沉积物的可蚀性:初步实验研究

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华东师范大学学报（自然科学版） 2020年第S01期 120-124页

作者： a.ESINa.Ra.heed dada olusegun a.IWa.U-BELLO Yinusa.贺治国浙江大学海洋学院浙江舟山316021 联邦理工大学海洋科学与技术系尼日利亚阿库雷340252 联邦理工大学应用地质系尼日利亚阿库雷340252

河口和沿海地区由于陆地和海洋的相互联系而具有重要的生态和经济意义.各种自然和人为事件影响着这些地区的地貌不平衡,因此研究泥沙输移动态有助于海岸带的可持续管理.本文研究了尼日利亚西南部大西洋沿岸海侵泥质海岸海相粘土的一些... 详细信息

河口和沿海地区由于陆地和海洋的相互联系而具有重要的生态和经济意义.各种自然和人为事件影响着这些地区的地貌不平衡,因此研究泥沙输移动态有助于海岸带的可持续管理.本文研究了尼日利亚西南部大西洋沿岸海侵泥质海岸海相粘土的一些基本物理和矿物性质.结果表明,该区粘土矿物以高岭石和伊利石为主.沉积物的水分和有机质含量较高,说明了微生物的作用和生物活性.它们具有相对较低的液限( 0.5).尽管沉积物通常是低塑性的有机粉土/粘土,但伊洛托罗泥浆倾向于中塑性到高塑性的有机粘土.此外,沉积物中有机质与粘土含量之间存在正相关关系,它们支持沉积物化学对其物理性质的影响,从而影响沉积物的可蚀性.需要进行进一步的研究,以确定沉积物的力学性质,并生成一个沉积物输运模型,用于准确预测淤泥质海岸沉积物的侵蚀阈值.这项研究的结果将适用于世界各地具有类似沉积物特性的海岸带,以满足环境、工程和公共卫生的需要.

关键词：河口泥泞的海岸可蚀性有结合力的沉积物

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Effect of La.d Ma.a.ement on Soil Hydra.lic Conductivity in Gida. Kwa.o, Niger Sta.e, Nigeria

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Open Journa. of Forestry 2021年第2期11卷 108-116页

作者： John Jiya.Musa.Otua.o Ebierin a.poebidimiyen Pius Olufemi olusegun dada Johnson Ka.ode a.ewumi Ya.a.a.Usma. Gupa Depa.tment of a.riculture a.d Bioresources Engineering Federal University of Technology Minna Nigeria Civil Engineering Depa.tment Maritime University Okerenkoko Nigeria Depa.tment of a.riculture a.d Bioresources Engineering Federal University of Agriculture Abeokuta Nigeria Depa.tment of a.ricultura. a.d Environmenta. Resource Engineering University of Maiduguri Maiduguri Nigeria

Hydra.lic conductivity is one of the most importa.t pa.a.eters for flow a.d tra.sport rela.ed phenomena.in soil a.d a.so a.criterion for mea.uring soil a.ility to tra.sfer wa.er. There is concern a.ising from the suita.ility, efficiency a.d ea.e of the different mea.uring methods use under different la.d ma.a.ement pra.tices. The purpose of this pa.er is to determine a.d eva.ua.e soil hydra.lic conductivity under different la.d ma.a.ement pra.tices which include forest la.d (tea. a.d Melina.pla.ta.ion), gra.sla.d a.d ma.ze cultiva.ed la.d using the consta.t hea. method. The mea.urement is a. different depth of 0 - 15 cm, 15 - 25 cm, 25 - 50 cm, 50 - 75 cm. The limited mea.s of ea.h la.d use were used to compa.e the result obta.ned through sta.istica. mea.s. a.l tests were ca.ried out using SPSS a. a.significa.ce level of 0.05. a. a.OVa.test wa. conducted to check if ea.h of the la.d use is significa.tly different. The soil in forest zone (Tea. pla.ta.ion a.d Gma.ina.pla.ta.ion) ha. a.significa.tly high bulk density a. 1.7533 cm-3 and 1.6967 cm-3 respectively at depth 50 - 75 cm compared to the low bulk density in the grass, maize cultivated land as 1.5000 cm-3 and 1.4833 cm-3 respectively at depth 50 - 75 cm. However, soil hydraulic conductivity was significantly high in the grass site or soil at the surface with 2.8833 cm·h-1a. style="font-fa.ily:Verda.a.">. Results obta.ned from the different la.d use serve a. Knowledge of va.ia.ility of soil tha. ca. a.sist in defining the best stra.egies for susta.na.le soil ma.a.ement through the pro

关键词： Bulk Density La.d Ma.a.ement Pra.tices Porosity Soil Hydra.lic Conductivity

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Eva.ua.ion of Tempora. Cha.ges in Deep Well Wa.er Qua.ity in Iga.i Loca. Government a.ea.of Ka.una.Sta.e

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Journa. of Environmenta. Protection 2020年第1期11卷 22-33页

作者： John Jiya.Musa.Otua.o Ebierni a.poebidimiyen Moha.med Ta.imu Musa.Pius olusegun Olufemi dada Elija. Tsa.o Musa Depa.tment of a.ricultura. a.d Bioresources Engineering Federal University of Technology Minna Nigeria Civil Engineering Depa.tment Maritime University Okerenkoko Nigeria Depa.tment of a.ricultura. a.d Bio-Environmenta. Engineering Kaduna Polytechnic Kaduna Nigeria Depa.tment of a.ricultura. a.d Bioresources Engineering Federal University of Agriculture Abeokuta Nigeria Centra. Resea.ch La.ora.ory University of Ilorin Ilorin Nigeria.

The resea.ch work wa. ca.ried out in Iga.i Loca. Government of Ka.una.Sta.e. Thirty wa.er sa.ples from boreholes were ra.domly collected within the ma.or towns in November to a.ril (Dry), a.d Ma. to October (Ra.ny sea.on). The sa.ples were a.a.yzed for physica., chemica., a.d ba.teriologica. pa.a.eters a.d to observe a.y cha.ges in the groundwa.er qua.ity of the a.ea. a.a.ysis of va.ia.ce (a.OVa., Pea.son Correla.ion were performed on the da.a.obta.ned using SPSS 10.0 for a.window for significa.t va.ia.ions a.d inter-element rela.ionship. High mea. turbidity wa. recorded in boreholes in Da.fili (12.2 NTU), Kwa.a. (6.2 NTU). Mea. turbidity of 4.3 NTU wa. recorded in Dry sea.on for wells with Riga.hikun ha.ing 5.1 NTU. It wa. observed tha. a.nega.ive correla.ion exists between well depth a.d hea.y meta. concentra.ion. There wa. a.so a.linea. rela.ionship of 0.686 between well dista.ce a.d nitra.e (fa.ca. conta.ina.t). Mea. va.ue for Fluoride (0.22 mg/l), Sodium (20.78 mg/l), Ca.cium (15.7 mg/l), Iron (0.013 mg/l), Nitra.e (3.69 mg/l), Ca.mium (0.00102 mg/l) Chloride (22.107 mg/l) recorded for sa.pled wells were a.l within WHO sta.da.d. a.high va.ue of 24 mg/l a.d 25 mg/l for Nitra.e wa. recorded in Sa.ina.a.Roa. a.d Da.fili. a. indica.ion of conta.ina.ion during the ra.ny sea.on indica.es surfa.e-groundwa.er intrusion (influx). The results of the ba.teriologica. a.a.ysis indica.ed tha. most wells sa.pled ha.e a.ra.ge of 1 cfu/100 ml to 7 cfu/100 ml with Da.fili Ma.i ha.ing the highest va.ue (7 cfu/100 ml) which ma.e it unsa.ed (not Pota.le).

关键词： Tempora. Cha.ge a.a.ysis Groundwa.er Physiochemica. Ba.teriologica. Qua.ity

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近60年来南黄海沉积物高分辨率敏感粒级对东亚冬季风的响应

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海洋地质前沿 2016年第8期32卷 1-9页

作者：高星华李广雪张海啟 dada olusegun a.刘世东陈中亚李亨健王琳淼刘玲海底科学与探测技术教育部重点实验室青岛266100 中国海洋大学海洋地球科学学院青岛266100 中国地质调查局发展中心北京100011 联邦理工大学海洋科学与技术学院中国科学院海洋研究所青岛266071

对南黄海中部泥质区F306柱状样的沉积物进行分析,运用粒径—标准偏差法,得出该孔敏感粒级组分为23.10~65.30μm（5.44Φ~3.94Φ）,其粒级的含量15.6%~22.3%,平均粒径38.5~41.4μm（4.70Φ~4.59Φ）,证明敏感粒级可以作为东亚冬季风的高... 详细信息

对南黄海中部泥质区F306柱状样的沉积物进行分析,运用粒径—标准偏差法,得出该孔敏感粒级组分为23.10~65.30μm（5.44Φ~3.94Φ）,其粒级的含量15.6%~22.3%,平均粒径38.5~41.4μm（4.70Φ~4.59Φ）,证明敏感粒级可以作为东亚冬季风的高分辨率替代指标,进一步阐明了敏感粒级作为东亚冬季风替代指标在更高分辨率上的可行性。根据敏感粒级沉积记录,在1950—1986年期间,将东亚冬季风分为强—弱—强3个阶段,指示了该阶段东亚冬季风存在近10年的周期。1986/1987为近60多年来东亚冬季风由强变弱的转折点,与东亚气候变化具有较好的对应关系,首次在中国东部海域中记录了此逆转事件,认为1986年后沉积物敏感粒级的变粗可能与长江物源变粗、东亚冬季风的减弱以及夏季风增强有关。

关键词：南黄海泥质区敏感粒级东亚季风高分辨率长江输沙

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Effect of La.d Ma.a.ement on Soil Hydra.lic Conductivity in Gida. Kwa.o,Niger Sta.e,Nigeria

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Open Journa. of Forestry 2021年第2期

作者： John Jiya.Musa.Otua.o Ebierin a.poebidimiyen Pius Olufemi olusegun dada Johnson Ka.ode a.ewumi Ya.a.a.Usma. Gupa

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