The exploration of relationship between land subsidence and landscape transformation     

Chung  Chen-Kun 《Natural Hazards》2019,98(3):1051-1089

Natural Hazards - In the present study, a recently developed novel approach (Bender et al. in J Hydrol 514:123–130, 2014) has been further extended to investigate the changes in the joint...  相似文献   

Interdecadal change in typhoon genesis condition over the western North Pacific     

Yumi Choi  Kyung-Ja Ha  Chang-Hoi Ho  Chul Eddy Chung 《Climate Dynamics》2015,45(11-12):3243-3255

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Green growth machines? Competing discourses of urban development in Playa Vista,California     

Christine L. Jocoy 《Urban geography》2018,39(3):388-412

Playa Vista is a massive mixed-use development built on coastal wetlands in west Los Angeles. Its land use story illustrates how strategically constructed discourses shape contested urban spaces. Through an analysis of newspaper reporting and government documents, this paper traces how pro-Playa Vista interests changed their growth discourses rationalizing the development between 1979 and 2015. Findings suggest that pro-growth coalitions are resilient when they modify their discourses to negotiate new regulatory and political contexts, specifically pursuing sustainability fixes. They are not dogmatic in their adherence to orthodoxies of private property rights and “highest and best use” of land but rather continually reconstruct growth discourses incorporating enough of the values of their opponents (i.e. “green” values such as growth management and smart growth) that some environmental and homeowner citizens’ groups join the growth coalition, forming a “green growth machine” that not only profitably builds on the land but finances ecological restoration.  相似文献   

Late Holocene hydroclimatic variability linked to Pacific forcing: evidence from Abbott Lake,coastal central California     

Christine A. Hiner  Matthew E. Kirby  Nicole Bonuso  William P. Patterson  Jennifer Palermo  Emily Silveira 《Journal of Paleolimnology》2016,56(4):299-313

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Seismic imaging of the axial region of the Valu Fa Ridge, Lau Basin—the accretionary processes of an intermediate back-arc spreading ridge     

Ian M. Turner  Christine Peirce  & Martin C. Sinha 《Geophysical Journal International》1999,138(2):495-519

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Effect of thickness of planar nozzles on erosion depth of levee soils subjected to plunging water     

Chung Rak Song  Jinwon Kim  James Tyler Kidd  Alexander Cheng  David Admiraal 《国际泥沙研究》2018,33(3):243-249

In this study, the effect of the thickness of a planar jet on the erosion depth when the jet impinges on a surface composed of cohesive soil was analytically and numerically evaluated. The results showed that the erosion depth was practically independent of the nozzle thickness for erosion depths shallower than the potential core length (i.e. the region of the jet in which the central flow velocity is the same as the nozzle velocity). The relation between nozzle thickness and erosion depth was non-linear with continuously variable slope for erosion depths deeper than the potential core length. Finally, the relation was approximately linear when the erosion depth converged to the equilibrium erosion depth. The findings of this study indicate that direct and fast prediction of the erosion depth in the field is possible using the data from a small scale soil erosion test with similar flow velocities.  相似文献   

Design of dampers for structures based on optimal control theory     

Chin‐Hsiung Loh  Pei‐Yang Lin  Nan‐Hau Chung 《地震工程与结构动力学》2000,29(9):1307-1323

The aim of this paper was to propose a design guideline for using visco‐elastic dampers for the control of building structures subjected to earthquake loading as well as suspension roof structures subjected to wind loading. The active control algorithm was used to calculate the control forces. Based on the single‐mode approach the control forces were transformed to the forces which visco‐elastic dampers can provide. Application of the method to the design of the building structure with passive damping devices in the bracing system and to the suspension roof with dampers was studied. Through the application of optimal control theory a systematic design procedure to implement dampers in structures is proposed. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Sliding mode fuzzy control: Theory and verification on a benchmark structure     

Saang Bum Kim  Chung Bang Yun 《地震工程与结构动力学》2000,29(11):1587-1608

A sliding mode fuzzy control (SMFC) algorithm is presented for vibration reduction of large structures. The rule base of the fuzzy inference engine is constructed based on the sliding mode control, which is one of the non‐linear control algorithms. In general, fuzziness of the controller makes the control system robust against the uncertainties in the system parameters and the input excitation, and the non‐linearity of the control rule makes the controller more effective than linear controllers. For verification of the present algorithm, a numerical study is carried out on the benchmark problem initiated by the ASCE Committee on Structural Control. To achieve a high level of realism, various aspects are considered such as actuator–structure interaction, sensor noise, actuator time delay, precision of the A/D and D/A converters, magnitude of control force, and order of control model. Performance of the SMFC is examined in comparison with those of other control algorithms such as H_{mixed 2/∞}, optimal polynomial control, neural networks control, and SMC, which were reported by other researchers. The results indicate that the present SMFC is efficient and attractive, since the vibration responses of the structure can be reduced very effectively and the design procedure is simple and convenient. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Establishing absorbed energy spectra—an attenuation approach     

Chung‐Che Chou  Chia‐Ming Uang 《地震工程与结构动力学》2000,29(10):1441-1455

For energy‐based seismic design, energy demand in the form of absorbed energy spectra was established by an attenuation relationship. The absorbed energy is proposed for evaluating the energy demand in an inelastic system because the absorbed energy is directly related to the pseudo‐velocity in the elastic case. Based on a total of 273 ground motion records from 15 significant earthquakes in California, an attenuation relationship of the absorbed energy was established from a two‐stage non‐linear regression analysis. This relationship was established for a given earthquake magnitude, source‐to‐site distance, site class, and ductility factor. A similar expression for the normalized absorbed energy was also developed. This study showed that the absorbed energy for near‐field ground motions can be significantly larger than that predicted by the attenuation relationship for normal ground motions. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Innovation in GIS Research UK     

Dr. Christine E. Dunn 《Transactions in GIS》2010,14(3):219-221

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