The dynamic characteristics of pressurized cylindrical membranes used as dams are considered here. Single-anchored air-inflated membranes are predominantly studied. Load combinations are considered without any water, with impounding water, and with water overflow. The two major experimental variables are the dam's internal pressure and the stream's flow rate or the impounded water height. The existence of upstream water is shown to completely change the dynamic characteristics of the membrane-dam, now a structure-fluid system. Two aspect ratios are considered with the same height, at two separate open-channel facilities. The material used is modeled as an inextensible weightless membrane without any bending stiffness. It is shown that the ratio between the internal pressure head and the upstream water head, identified as the "pressure ratio", is the major controlling parameter. During overflow conditions, the pressure ratio is shown to have a critical value where the energy of vibration maximizes. In addition, the ratio of the upstream water head to the dam's height, identified as the "load ratio", is non-linearly proportional to the vibration's energy level. Both the pressure ratio and the load ratio are shown to be dependent on the model's aspect ratio. The pressure ratio is slightly non-linearly proportional to the natural frequencies of the system, while the load ratio is inversely proportional. Up-scaling of the results follows the Froude law. The source of vibrations either in the form of a driving force or a perturbation force is identified to be at the downstream base of the dam. / Ph. D.

Inflatable dams are flexible membrane structures, pressurized with either air, water, or both, which have been used in recent years as a means of temporarily impounding water. A number of procedures have been developed to investigate the static behavior of the dams, but the dynamic behavior has been largely neglected. The few studies that have been done on dynamic behavior have used the simplifying assumption that the weight of the membrane was negligible. In this study, equations of equilibrium and equations of motion were derived for an air inflated dam impounding no water, but loaded with its own membrane weight. It was assumed that the effect of membrane extensibility is negligible in the analysis. Derivatives required in the equations of motion were approximated using finite difference equations. Computer programs were written to find solutions for the eigenvalues and eigenvectors of the equations of motion. The computer program plotted the mode shapes of vibration associated with the four lowest eigenvalues, as well as the static shape of the dam. The eigenvalues obtained were the square of the frequencies of the system, so the effects of a series of membrane weights on the frequencies of dams of various base lengths could be analyzed. / M.S.

In recent years the use of inflatable dams has become more widespread throughout the world. Various people have done studies on the shape and membrane tension of these structures; however, only a few authors have considered dynamic behavior. Due to the nature of the applications and the material composition of these structures, a study considering the dynamic response of an inflatable dam is warranted. In this study, the equation of motion for an air-inflated dam is derived, then solved using the Galerkin approximation method. The solution is performed for a one-term approximation and a two-term approximation, where both solutions use a sine function to approximate the deflected shape of the dam. Frequencies and amplitudes are calculated and presented in tables and plots for the first four modes, and three different values of the central angle of the dam. Comparisons to the results of other studies are presented at the conclusion of this study. / Master of Science

Thesis advisor: Noah Snyder / Rivers impounded by dams experience morphological changes that provide an opportunity to calculate reservoir sedimentation rates and relate them to watershed land-use history. In April 2023, 10 sediment cores were collected from 5 locations in Lake Seminole, Georgia. Analysis of loss on ignition (LOI), bulk density, elemental concentrations, and short-lived radionuclide geochronology aided in completing the following research objectives: correlating short and long sediment cores, determining whether the pre-dam sediment surface was reached at each location, measuring the sedimentation rates in the Chattahoochee and Flint arms of the reservoir, and evaluating the characteristics of each core in the context of its location and the history of Lake Seminole. This research explores how differences in river management, land use, and upstream geology in the watersheds have contributed to sedimentation differences in the Chattahoochee and Flint Rivers. / Thesis (BS) — Boston College, 2024. / Submitted to: Boston College. Morrissey School of Arts and Sciences. / Discipline: Earth and Environmental Sciences. / Discipline: Departmental Honors.

Thesis (MSc)--Stellenbosch University, 2012. / ENGLISH ABSTRACT: A trial closure of the emergency gate of the Berg River Dam was undertaken by the Trans- Caledon Tunnel Authority (TCTA) on 12 June 2008. The air vent downstream of the emergency gate was designed to introduce air to mitigate the negative pressures that were expected in the conduit during emergency gate operations. The emergency gate has to close when the radial gate at the downstream end of the outlet conduit fails. Contrary to the theoretical design, the measured air vent velocities in the field indicated that, while the emergency gate was closing, very large volumes of air were apparently continuously being released from the air vent, commencing when the gate was about 30% closed (i.e. 70% open). This is in contrast to what the design intended, namely that air should have been drawn into the vent. This thesis is concerned with the testing of a 1:14.066 physical model representing the outlet works and air vent of the Berg River Dam as a means to determine the reasons for the release of large volumes of air from the air vent during the trial closure in 2008. It also seeks solutions to mitigate the excessive airflow from the air vent. It was concluded that the air velocity in the air vent was independent of the rate of closure of the emergency gate, but to increase with increasing water head. The problem at the Berg River Dam was determined to be one of air blowback. Modifications were made to the configuration of the model in order to determine whether the configuration of the outlet works caused air to be released from the air vent. It was determined that the downward sloping roof at the outlet of the conduit, used to accommodate the radial gate chamber, was the cause of the air blowback phenomenon. An additional air vent was fitted directly onto the conduit at the constriction was found to be ineffective in reducing the air blowback. It was concluded that there are no rational structural change that can prevent or inhibit a recurrence of the blowback phenomenon in the Berg River Dam outlet conduit. The recommendation follows that the outlet conduit should not be constricted by any structural or mechanism further downstream in the conduit. / AFRIKAANSE OPSOMMING: ʼn Toetssluiting van die noodsluis van die Bergrivierdam is op 12 Junie 2008 deur die TCTA (Trans-Caledon Tunnel Authority) uitgevoer. Die lugskag stroomaf van die noodsluis is ontwerp om lug in te voer om die verwagte negatiewe drukke tydens die noodsluissluiting te beperk. Die noodsluis moet sluit indien die radiaalsluis aan die einde van die uitlaatpyp sou faal. In teenstelling met die teoretiese ontwerp, het die gemete lugsnelhede in die lugskag in die veld aangedui dat groot volumes lug voortdurend uit die lugskag vrygelaat word wanneer die noodsluis ongeveer 30% toe is (dit wil sê 70% oop). Dit is in teenstelling met die ontwerp, want die lugskag is ontwerp vir die insuig van lug. Hierdie tesis het ten doel om die redes vir die vrylating van groot volumes lug uit die lugskag vas te stel met behulp van ʼn 1:14.066 fisiese skaalmodel van die uitlaatwerke en lugskag van die Bergrivierdam soos getoets tydens die inwydingstoetssluiting in 2008. Die toetse op die model het getoon dat die lugsnelheid in die lugskag onafhankik van die sluistoemaak tyd is, maar verhoog met die toename in die watervlak. Die Bergrivier dam probleem was bepaal as die van lug terugslag. Die model is gewysig ten einde te bepaal of die spesifieke samestelling van die uitlaatwerke die oorsaak van die vrystelling van lug uit die lugskag is. Die analises en verandering aan die uitleg toon aan dat die skuins afwaartse dak van die uitlaattonnel om die radiaalsluiskamer te huisves die rede was vir die vrylating van die lug uit die lugskag. ‘n Addisionele lugskag was gebou in die dak van die uitlaattonnel reg bo die sametrekking, maar was oneffektief om die terug vloei van lug te verminder. Die gevolgtrekking is dat daar geen rasionele strukturele verandering aangebring kan word aan die Bergrivier dam om die vrystelling van lug uit die lugskag te verhoed of te verminder nie. ’n Aanbeveling vir toekomstige ontwerpe is dus dat die uitlaattonnel nie beperkend by die uitlaatend moet wees nie.

自2003年始，反坝运动席卷中国，被誉为“第一次公众参与开始影响中国工程决策"。相关研究多将之归功于中国近年来迅猛发展的公民社会与NGO力量。但在金沙江边村落，却出乎意料地形成可持续的、无（正式）组织及去精英化、本土民众自主广泛参与的反坝集体行动，并成功令当地水坝建设中止至今。本个案的独特性，无法单独通过社会运动或底层抗争理论对中国集体抗争的分析，而得到解释。 / 在中国特殊政治环境下，尤其在严重缺乏自组织空间的底层乡土社会，农民广泛参与的集体抗争如何得以成为可能？带着这一问题，本研究整合社会运动研究和底层抗争研究两种理论框架，以实践论引领下的拓展个案研究法为研究方法论，对金沙江-虎跳峡流域的反坝集体行动展开深入研究。 / 论文首先还原当地反坝抗争的真实经历以及底层行动者的实践逻辑，并通过对抗争的政治机会空间拓展、组织动员、框架与意义建构等三个关键过程深入分析，探讨集体行动的内在特征及发生机制。 / 本论文发现：在全国反坝热潮背后，金沙江边逐渐形成一类独特的、既由本土社区主导又与全国性的反坝社会运动接壤的、多元去中心化的新型底层抗争生成机制/模式。三种结构性生成力量在背后起到关键作用：一是本土性社会文化因素；二是介入本土社区并与之发生紧密互动的外界公民社会力量；三是国家力量（包括“抽象国家"与“具体国家"）的影响及其与本土的互动。 / 以上因素在型塑独特的本土集体抗争模式的同时，也在底层乡村社区催生一批本土中层集体行动者骨干，推动广泛、具有潜在秩序的草根民众的“公民性"参与，孕育出更富于弹性、更多元异质的社会力以及本土化的公民社会行动空间，由此产生的底层自下而上的变革动力，有可能超越此前公民社会组织主导的社会运动与封闭乡村社区内相对无组织无序的底层抗争的两分，为中国底层变迁乃至公民社会发展预示新的路向。 / Recent anti-dam movements in quasi-authoritarian China have triggered unprecedented public debate. Most existing researches focus on professional NGOs, intellectuals, media and other high-profile civil society forces, and propose an exogenous elite-driven model for understanding the movement and ensued social changes. / However, the Jinsha River anti-dam protest revealed a different picture: endogenously grown and widely participated activism is blooming in the local communities, in the absence of formal movement organizations and without the leadership of outside NGOs. It is such local activism, working together with civil society forces from outside, that successfully blocked the dam construction. / How could such indigenous activism with broad participation emerge within the highly restricted political space of contemporary China? To answer this question, I propose an integrated approach combining the perspectives of the social movement literature and the resistance studies. The major research methodology is the Extended Case Method (ECM) based on the Theory of Practice. / This thesis firstly attempts to describe the generative process of local anti-dam protest activism and the practical logic of indigenous activists from a bottom-up perspective. It analyzes the key processes of political opportunity structure extension, resource mobilization, and meaning construction in the indigenous anti-dam movement, trying to understand its unique characteristics, dynamics and mechanisms. / The study finds that the Jinsha River case is characterized by a distinct activism model which is endogenously driven, with highly decentralized participation from diverse sectors in the local community, and also influenced by the interactions between the local protest and national anti-dam movement. In particular, I discuss three sets of factors that are crucial in shaping the process: a) the local social-cultural contexts and conditions, b) the interaction between the local community and outside civil social forces in the anti-dam movement, c) the state-society relationship in the indigenous community. / These factors contribute to the emergence of a model of local activism which transcends the conventional dichotomy of movement leaders and rank and file members, and relies instead on a large “middle layer of activists that are from diverse sectors of the local community. It may point to a path for going beyond both the elitist NGO-lead social movement model and the model of disorganized social resistance in closed rural communities, and shed light on some new potential of Chinese social change from below as well as the development of Chinese civil society. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / 周雁. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references (leaves 222-226) / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in Chinese and English. / Zhou Yan. / 致 谢 --- p.iv / 中文摘要： --- p.vi / Abstract of thesis entitled : --- p.vii / Chapter 1 --- 前言：研究背景及研究问题的提出 --- p.1 / Chapter 1.1. --- 引子：3.21群体事件 --- p.1 / Chapter 1.2. --- 研究的背景：从本土底层抗争到全国反坝运动 --- p.2 / Chapter 1.3. --- 研究问题: --- p.6 / Chapter 2 --- 文献综述与理论回顾 --- p.9 / Chapter 2.1. --- 理论视野之一： 西方集体行动/社会运动理论 --- p.9 / Chapter 2.1.1. --- 美国社会运动理论 --- p.9 / Chapter 2.1.2. --- 新的理论发展 --- p.11 / Chapter 2.2. --- 理论视野之二：抗争研究 --- p.13 / Chapter 2.2.1. --- 农民的日常反抗理论 --- p.13 / Chapter 2.2.2. --- 依法抗争理论及中国学者的进一步拓展 --- p.14 / Chapter 2.3. --- 中国反坝集体行动的现有研究： --- p.17 / Chapter 2.4. --- 社会运动研究与抗争研究的差异与整合 --- p.21 / Chapter 2.4.1. --- 两种理论进路的差异 --- p.21 / Chapter 2.4.2. --- 本研究面临的特殊情境 --- p.22 / Chapter 2.4.3. --- 整合及研究理论框架的提出 --- p.25 / Chapter 3 --- 研究方法论及研究方法 --- p.29 / Chapter 3.1. --- 研究方法论 --- p.29 / Chapter 3.1.1. --- 研究方法论的理论基础：实践理论 --- p.29 / Chapter 3.1.2. --- 具体研究方法论：拓展个案法 --- p.33 / Chapter 3.2. --- 研究方法及参与式行动研究者的自我反思 --- p.35 / Chapter 3.2.1. --- 研究方法 --- p.35 / Chapter 3.2.2. --- 参与式行动研究者的自我定位及反思 --- p.36 / Chapter 3.3. --- 研究田野点：金沙江边乡村社区简介 --- p.40 / Chapter 3.4. --- 论文结构 --- p.45 / Chapter 4 --- 江边底层反坝抗争故事及过程分析 --- p.48 / Chapter 4.1. --- 江边底层反坝抗争过程回顾 --- p.48 / Chapter 4.1.1. --- 风云乍起：反坝外部动员及本土精英崭露头角 --- p.48 / Chapter 4.1.2. --- 从葬礼到清明：变故催生的内外结盟与江边动员 --- p.52 / Chapter 4.1.3. --- 本土自主底层抗争模式的发端：罢村官事件及其他 --- p.62 / Chapter 4.1.4. --- 外来者的“在场"和助推 --- p.69 / Chapter 4.1.5. --- 本土自主抗争的深化：文艺队及其他公共参与的尝试 --- p.75 / Chapter 4.1.6. --- 厚积薄发：联名信的万人签署及上京 --- p.85 / Chapter 4.1.7. --- 高潮：3.21万人群体事件 --- p.91 / Chapter 4.1.8. --- 后反坝时期 --- p.103 / Chapter 4.2. --- 小结与回顾：江边反坝抗争的过程机制 --- p.108 / Chapter 4.2.1. --- 政治机会结构的拓展过程 --- p.109 / Chapter 4.2.2. --- 组织与动员过程 --- p.111 / Chapter 4.2.3. --- 框架与意义建构过程 --- p.112 / Chapter 4.2.4. --- 小结：三个过程的相通之处 --- p.113 / Chapter 5 --- 结构性因素之一：江边乡民社会的本土性因素 --- p.115 / Chapter 5.1. --- 江边本土行动者认同与惯习的形成及分化 --- p.116 / Chapter 5.1.1. --- 共享的“江边"认同及江边人的行为惯习 --- p.116 / Chapter 5.1.2. --- 江边多元分化的身份认同及行动惯习 --- p.119 / Chapter 5.1.3. --- 小结：不同结构性因素及条件的协同作用 --- p.134 / Chapter 5.2. --- 江边反坝行动者分层及其对抗争动力机制的影响 --- p.137 / Chapter 5.2.1. --- 对反坝政治机会结构的影响 --- p.137 / Chapter 5.2.2. --- 对反坝框架和意义建构的影响 --- p.139 / Chapter 5.2.3. --- 对组织和动员模式的影响 --- p.145 / Chapter 6 --- 结构性因素之二：外界公民社会力量的介入及内外互动 --- p.150 / Chapter 6.1. --- 外界力量的显性效果：底层议题的公共化 --- p.150 / Chapter 6.2. --- 外界力量介入的“多元去中心"化及效果 --- p.154 / Chapter 6.2.1. --- 外界力量的类别 --- p.154 / Chapter 6.2.2. --- 不同外来者的差异、碰撞与制衡 --- p.156 / Chapter 6.2.3. --- 外界介入的多元分殊化和去NGO化 --- p.158 / Chapter 6.2.4. --- 长期影响 --- p.162 / Chapter 6.3. --- 内外互动中的差异、分歧及潜在冲突 --- p.164 / Chapter 6.3.1. --- 差异的显现：认同与反坝框架建构 --- p.164 / Chapter 6.3.2. --- 对底层运作和“本土性"理解的隔阂 --- p.165 / Chapter 6.3.3. --- 背后的结构性因素 --- p.169 / Chapter 6.4. --- 小结 --- p.170 / Chapter 7 --- 结构性因素之三：国家力量的本土呈现 --- p.173 / Chapter 7.1. --- 本土行动者与“抽象国家"之间 --- p.173 / Chapter 7.1.1. --- 江边人的国家观及其体现 --- p.173 / Chapter 7.1.2. --- 被动应对：去“政治"化与去“国家"化 --- p.175 / Chapter 7.1.3. --- 积极对策：合法正当性的建立 --- p.176 / Chapter 7.2. --- 本土行动者与“具体国家"之间 --- p.180 / Chapter 7.2.1. --- 国家的本土代理人的分层 --- p.181 / Chapter 7.2.2. --- 本土行动者与国家代理人间的特殊互动模式 --- p.183 / Chapter 7.3. --- 理论对话及小结 --- p.190 / Chapter 8 --- 结论和进一步讨论 --- p.194 / Chapter 8.1. --- 底层集体行动如何得以产生 --- p.195 / Chapter 8.2. --- 底层反坝抗争的潜在产出及潜在长远影响 --- p.198 / Chapter 8.2.1. --- 底层行动者的改变：本土“公民性的形成与创新 --- p.198 / Chapter 8.2.2. --- “本土"的再发掘与重建：社区力量的创新整合 --- p.200 / Chapter 8.2.3. --- 中国新社会力及公共参与空间的拓展与建构 --- p.202 / Chapter 8.2.4. --- 对国家社会关系及中国社会变迁的长期潜在影响 --- p.203 / Chapter 8.3. --- 前瞻：潜在隐患及可能走向 --- p.205 / Chapter 附录一： --- 江边村民的诉求 --- p.208 / 2005清明扫墓活动村民面对NGO和媒体发言节选 --- p.208 / Chapter 附录二： --- 公开呼吁信 --- p.212 / Chapter （一） --- 中国河网：留住虎跳峡、留住长江第一湾 --- p.212 / Chapter （二） --- 金沙江沿岸村民呼吁：坚决不让悲剧在金沙江重演！ --- p.214 / Chapter 附录三 --- 万人联署意见书 --- p.217 / 关于“滇中调水"和虎跳峡电站高坝给国务院的意见书 --- p.217 / 参考文献 --- p.222

by Mo Pan. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1997. / Includes bibliographical references (leaves 150-160). / Table of Contents --- p.i / List of Tables --- p.vi / List of Figures --- p.viii / List of Plates --- p.viii / Abstract --- p.ix / Chapter Chapter 1 --- Introduction / Chapter 1.1 --- Background of the Three Gorges Dam Project --- p.1 / Chapter 1.2 --- Conceptual background of the study --- p.6 / Chapter 1.3 --- Objectives and significance --- p.16 / Chapter 1.4 --- Organization of the thesis --- p.18 / Chapter Chapter 2 --- Study Area and Experimental Design / Chapter 2.1 --- Zigui County --- p.20 / Chapter 2.2 --- Geology --- p.21 / Chapter 2.3 --- Climate --- p.22 / Chapter 2.4 --- Soil and vegetation --- p.22 / Chapter 2.5 --- Study area --- p.23 / Chapter 2.6 --- Experimental design --- p.26 / Chapter Chapter 3 --- Effect of Integrated Farming Practices on Soil Physical Properties / Chapter 3.1 --- Introduction --- p.30 / Chapter 3.2 --- Methodology --- p.32 / Chapter 3.2.1 --- Sampling methods --- p.32 / Chapter 3.2.2 --- Soil texture --- p.33 / Chapter 3.2.3 --- Aggregate stability --- p.33 / Chapter 3.2.4 --- Statistical analysis --- p.34 / Chapter 3.3 --- Results --- p.34 / Chapter 3.3.1 --- Effect of integrated farming practices on soil texture --- p.34 / Chapter 3.3.2 --- Effect of integrated farming practices on aggregate stability --- p.37 / Chapter 3.4 --- Discussion --- p.39 / Chapter 3.4.1 --- Soil textural change in relation to integrated farming practices and cultivation --- p.40 / Chapter 3.4.2 --- Aggregate stability of the newly rehabilitated soils --- p.43 / Chapter 3.5 --- Conclusion --- p.45 / Chapter Chapter 4 --- Effect of Integrated Farming Practices on Soil Chemical Properties / Chapter 4.1 --- Introduction --- p.46 / Chapter 4.2 --- Methodology --- p.48 / Chapter 4.2.1 --- Sample treatment --- p.48 / Chapter 4.2.2 --- Soil reaction --- p.49 / Chapter 4.2.3 --- Organic carbon --- p.49 / Chapter 4.2.4 --- Total Kjeldahl nitrogen (TKN) & available nitrogen (NH4-N and N03-N) --- p.50 / Chapter 4.2.5 --- Total and available phosphorus --- p.50 / Chapter 4.2.6 --- "Exchangeable K, Ca & Mg" --- p.51 / Chapter 4.3 --- Statistical Analysis --- p.51 / Chapter 4.4 --- Results --- p.52 / Chapter 4.4.1 --- Effects of integrated farming practices on soil reaction --- p.52 / Chapter 4.4.2 --- Effects of integrated farming practices on soil organic matter --- p.53 / Chapter 4.4.3 --- Effects of integrated farming practices on available nitrogen --- p.55 / Chapter 4.4.4 --- Effects of integrated farming practices on total Kjeldahl nitrogen (TKN) --- p.57 / Chapter 4.4.5 --- Effects of integrated farming practices on available phosphorus --- p.58 / Chapter 4.4.6 --- Effects of integrated farming practices on total phosphorus --- p.60 / Chapter 4.4.7 --- Effect of integrated farming practices on exchangeable potassium --- p.61 / Chapter 4.4.8 --- Effects of integrated farming practices on exchangeable calcium --- p.63 / Chapter 4.4.9 --- Effects of integrated farming practices on exchangeable magnesium --- p.65 / Chapter 4.5 --- Discussion --- p.66 / Chapter 4.5.1 --- The forgotten importance of pH --- p.67 / Chapter 4.5.2 --- The myth of soil organic matter --- p.70 / Chapter 4.5.3 --- Total Kjeldahl nitrogen and available nitrogen --- p.72 / Chapter 4.5.4 --- Total and available phosphorus --- p.77 / Chapter 4.5.5 --- The myth of exchangeable K and orchard growth --- p.78 / Chapter 4.5 --- Conclusion --- p.81 / Chapter Chapter 5 --- Effect of Integrated Farming Practices on Erosion / Chapter 5.1 --- Introduction --- p.84 / Chapter 5.2 --- Methodology --- p.90 / Chapter 5.2.1 --- Rainfall simulation --- p.90 / Chapter 5.2.2 --- Measurement of runoff and sediment --- p.92 / Chapter 5.2.3 --- Determination of soil volumtric moisture --- p.92 / Chapter 5.2.4 --- Statistical analysis --- p.93 / Chapter 5.3 --- Results --- p.93 / Chapter 5.3.1 --- "Effect of low intensity rainfall on time delay, duration, total runoff and mean discharge" --- p.93 / Chapter 5.3.2 --- "Effect of high intensity rainfall on time delay, duration, total runoff and mean discharge" --- p.95 / Chapter 5.3.3 --- "Effect of low intensity rainfall on sediment load, total soil loss and mean sediment loss rate" --- p.97 / Chapter 5.3.4 --- "Effect of high intensity rainfall on sediment load, total soil loss and mean sediment loss rate" --- p.98 / Chapter 5.3.5 --- Effect of hedgerow and farming practices on soil moisture under low intensity rainfall --- p.101 / Chapter 5.4 --- Discussion --- p.102 / Chapter 5.4.1 --- Effect of Vetivergrass hedgerow and integrated farming practices on runoff --- p.102 / Chapter 5.4.2 --- Effect of Vetivergrass hedgerow and integrated farming practices on soil loss --- p.106 / Chapter 5.4.3 --- Effect of Vetivergrass hedgerow and integrated farming practices on soil moisture --- p.110 / Chapter 5.5 --- Conclusion --- p.111 / Chapter Chapter 6 --- Crop Productivity: A Production Efficiency Analysis between Integrated Farming Practices and Existing Farming Systems in Zigui County / Chapter 6.1 --- Introduction --- p.113 / Chapter 6.2 --- Methodology --- p.115 / Chapter 6.2.1 --- Wheat and soybean production --- p.115 / Chapter 6.2.2 --- Socio-economic survey of agriculture in Zigui County --- p.116 / Chapter 6.2.3 --- Production efficiency analysis --- p.118 / Chapter 6.2.4 --- Statistical analysis --- p.119 / Chapter 6.3 --- Results --- p.119 / Chapter 6.3.1 --- Effect of integrated farming practices on wheat production --- p.119 / Chapter 6.3.2 --- Effect of integrated farming practices on soybean production --- p.120 / Chapter 6.3.3 --- Production efficiency of integrated farming systems (experimental plots) --- p.121 / Chapter 6.3.4 --- Production efficiency of existing systems (agricultural survey) --- p.122 / Chapter 6.5 --- Discussion --- p.124 / Chapter 6.5.1 --- Effect of integrated farming on wheat yield --- p.124 / Chapter 6.5.2 --- Effect of integrated treatments on soybean yield --- p.127 / Chapter 6.5.3 --- Will there be enough food production under integrated farming? --- p.129 / Chapter 6.5.4 --- Production efficiency analysis --- p.132 / Chapter 6.6 --- Conclusion --- p.136 / Chapter Chapter 7 --- Conclusion / Chapter 7.1 --- Summary of findings --- p.138 / Chapter 7.2 --- Implications of the study --- p.140 / Chapter 7.2.1 --- Demonstration farms and application of results to other parts of the TGR --- p.140 / Chapter 7.2.2 --- Commodity agriculture and regional specialization --- p.143 / Chapter 7.3 --- Limitation of the study --- p.145 / Chapter 7.4 --- Suggestion for further studies --- p.147 / Bibliography --- p.150 / Appendix A --- p.161

No description available.

In this study, dynamic response of Akk&ouml / pr&uuml / Dam under earthquake motions is analyzed and the permanent displacements are evaluated. Initially, the critical slip surface of the dam and the corresponding yield acceleration are determined by using the computer program SLOPE. Then, by employing the finite element program SAP2000, static analyses are performed to obtain the mean effective stresses which are used in the determination of dynamic material properties of the dam. Four different scenario earthquakes having a magnitude of 7 are used in the dynamic analyses. Two of those scenarios are taken from European Strong Motion Database and the others are generated by XS artificial earthquake generation program prepared by Erdik (1992). Dynamic analyses of the dam are carried out by the finite element program TELDYN. Permanent displacements of the critical slip surface are calculated by utilizing the Newmark method. Consequently, for an earthquake having a magnitude of M=7 and a peak ground acceleration of 0.20g, the maximum permanent displacement of the dam is found to be 15.90 cm. Furthermore, the permanent displacements of the dam are calculated under base motions having different peak ground acceleration values and it is observed that the rate of increase in the amount of permanent displacements is greater than the increase in the amount of peak ground accelerations.

Thesis (M.Sc. (Statistics)) -- University of Limpopo, 2022 / Water is a precious natural resource and one of the most vital substance for sustainability of life . The increase in water evaporation is a major prob lem where factors such as high temperature and minimum rainfall are the contributing factors. The aim of the study was to perform time series mod elling of water evaporation from the selected dams in the Limpopo province South Africa. A daily evaporation time series data was used in the study with variables such as temperature and rainfall. Daily water evaporation rate time series data was differenced to make the data series stationary and Dickey-Fuller test was used to test the stationarity of the data series. The Autoregressive Conditional Heteroskasticity (ARCH) and Generalized Au toregressive Conditional Heteroskasticity (GARCH) model was performed on the water evaporation time series data from the selected dams. Vec tor Autoregression (VAR) was used to determine the relationship between the variables evaporation, rainfall and temperature. Identification of time series models was done using the autoregressive integrated moving average (ARIMA). The best ARIMA models were selected based on the autocor relation function (ACF) and partial autocorrelation function (PACF), and the smallest value of Bayseian Information (BIC). The best models selected for each dam are: Mokolo dam, ARIMA (1, 1, 2) model; Ga-Rantho dam, ARIMA (1, 1, 2) model; Leeukraal DeHoop dam, ARIMA (1, 1, 1) model and Luphephe dam, ARIMA (2, 1, 3) model. The correlation coefficient, coefficient of determinant (R2 ) and root mean square (RMSE) were used to determine the performance of the model. The water evaporation time series data from the selected dams was forecasted using the best selected ARIMA models from the selected dams and then predicted for the next 3 years, where the results showed a positive constant water evaporation rate.