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Morphological evolution of a large sand bar in the Qiantang River Estuary of China since the 1960s

Acta Oceanologica Sinica 2022年第2期41卷 156-165页

作者： Junbao Huang zhilin sun Dongfeng Xie Ocean College Zhejiang UniversityZhoushan 316021China Zhejiang Institute of Hydraulics and Estuary Hangzhou 310020China College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China

A large sand bar develops in the inner Qiantang River Estuary,*** is a unique sedimentary system,elongating landwards by about 130 *** on long-term series of bathymetric data in each April,July,and November since the 1960s,this study investigated the morphological behavior of this bar under natural conditions and the influence of a large-scale river narrowing project(LRNP)implemented in the last *** results show that three timescales,namely the seasonal,interannual and decadal timescales,can be distinguished for the sand bar *** first two are related to the seasonal and interannual variations of river *** high discharge seasons or years,erosion took place at the upper reach and sedimentation at the lower ***,the bar apex shifted *** opposite development took place during low discharge seasons or *** decadal timescale is related to *** to the implementation of LRNP,the upper reach has experienced apparent erosion and currently a new equilibrium state has been reached;whereas the lower reach has been accumulated seriously and the accumulation still *** relationships for how the bar apex location and elevation depend on the river discharge over various stages of LRNP have been *** with the earlier stage of LRNP,the bar apex at present has shifted seaward by about 12 km and lowered by about 1 *** sand bar movement has significant feedback on the hydrographic conditions along the estuary and has practical implications for coastal management.

关键词： morphological evolution river discharge sand bar Qiantang River Estuary river narrowing project coastal management

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Investigation on optimization design of equivalent water depth truncated mooring system

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Science China(Physics,Mechanics & Astronomy) 2009年第2期52卷 277-292页

作者： ZHANG HuoMing sun zhilin YANG JianMin GAO MingZheng Department of Hydraulic and Ocean Engineering Zhejiang UniversityHangzhou 310058China College of Metrology Technology and Engineering China Jiliang UniversityHangzhou 310018China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200030China

The oil industry is now increasingly concentrating their efforts and activities in connection with de- veloping fields in deeper waters, ranging typically from 500 m to 3000 m worldwide. However, the modeling of a full-depth system has become difficult presently; no tank facility is sufficiently large to perform the testing of a complete FPS with compliant mooring in 1000 m to 3000 m depth, within rea- sonable limits of model scale. Until recently, the most feasible procedure to meet this challenge seems to be the so-called "hybrid model testing technique". To implement this technique, the first and im- portant step is to design the equivalent water depth truncated mooring system. In this work, the opti- mization design of the equivalent water depth truncated mooring system in hybrid model testing for deep sea platforms is investigated. During the research, the similarity of static characteristics between the truncated and full depth system is mainly considered. The optimization mathematical model for the equivalent water depth truncated system design is set up by using the similarity in numerical value of the static characteristics between the truncated system and the full depth one as the objective function. The dynamic characteristic difference between the truncated and full depth mooring system can be minished by selecting proper design rule. To calculate the static characteristics of the mooring system, the fourth order Runge-Kutta method is used to solve the static equilibrium equation of the single mooring line. After the static characteristic of the single mooring line is calculated, the static charac- teristic of the whole mooring system is calculated with Lagrange numerical interpolation method. The mooring line material database is established and the standard material name and the diameter of the mooring line are selected as the primary key. The improved simulated annealing algorithm for continual & discrete variables and the improved complex algorithm f

关键词： equivalent water depth truncated mooring system optimization design hybrid model testing technique FPSO hydrodynamic response si- mulated annealing algorithm complex algorithm

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Concept and evaluation of bay health:the role of numerical model in the Yueqing Bay,China

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Acta Oceanologica Sinica 2016年第8期35卷 3-15页

作者： ZHOU Dacheng sun zhilin HUANG Yu HUANG Saihua LI Li Ocean College of Zhejiang University Hangzhou 310058China State Key Laboratory of Marine Environmental Science(Xiamen University) Xiamen 361005China

To better evaluate the three-dimensional bay health and predict the dynamic bay health conditions, a concept of numerical bay health was introduced and a method of numerical bay health evaluation（NBHE） was *** support the NBHE method, a numerical bay health index（NBHI） system was constructed, which assess the natural and socio-economic effects on the entire bay. Five index groups are combined to formulate the NBHI,including geometry, hydrodynamics and sediment dynamics, bio-ecology, water quality and *** group has different number of indices selected and weighted using AHP method according to their importance. Data were mainly synthesized from a variety of numerical models together with monitoring programs, which provide superior to other approaches in discriminating data integrity and predicting data in future. The NBHE method using NBHI system was applied in the Yueqing Bay during spring tide in April *** to the NBHE results, Sta. A, at the surface level of the estuarine mouth, has a healthy geometry condition, sub-healthy hydrodynamic and sediment dynamic condition, and unhealthy water quality and bioecology conditions. The integrated healthy score at Sta. A indicates its sub-healthy condition.

关键词： numerical bay health concept numerical model numerical index system three dimensional evaluation Yueqing Bay

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Vertical concentration profile of nonuniform sediment

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International Journal of Sediment Research 2021年第1期36卷 120-126页

作者： zhilin sun Haolei Zheng Dan Xu Chunhong Hu Chaofan Zhang Institute of Port Coastal and Offshore Engineering Zhejiang University State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin

A new formula for the concentration profile of nonuniform sediment is derived using the diffusion differential equation with equilibrium bed *** interaction coefficient for nonuniform sediment particles as a function of both relative diameter and geometric standard deviation of nonuniform sediment is taken into account in the settling *** diffusion coefficient is obtained from the logarithmic velocity *** new formula possesses several advantages as follows:(1) avoids theoretical defect of the Rouse formula,which states that the sediment concentration is infinite at the bottom and zero at the water surface.(2) suitable for an arbitrary fraction of nonuniform sediment,and(3) easy to apply with a simple *** formula yields less difference among concentration profiles for various particles than that for uniform sediment and reveals the law for fractional conce ntration distribution of nonuniform *** calculated concentration agrees well with the measured data from the Yangtze River.

关键词： Nonuniform sediment Concentration profile Interaction coefficient

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Short-term offshore extension of Brahmaputra-Ganges and Irrawaddy freshwater plumes to the central northern Bay of Bengal based on in situ and satellite observations

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Acta Oceanologica Sinica 2021年第5期40卷 80-93页

作者： Zhiyuan Li Saihua Huang Xiaohua Zhu zhilin sun Yu Long Huawei Xie Key Laboratory for Technology in Rural Water Management of Zhejiang Province Zhejiang University of Water Resources and Electric PowerHangzhou 310018China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China Ocean College Zhejiang UniversityZhoushan 316021China

In this study, the short-term offshore extension of Brahmaputra-Ganges(BG) and Irrawaddy freshwater plumes to the central northern Bay of Bengal(BoB) was investigated based on in situ and satellite observations. In the summer and winter of 2015, two significant freshening events with periods of weeks were observed from a moored buoy at 15°N, 90°E in the BoB. Soil Moisture Active Passive(SMAP) satellite sea surface salinity compares well with the in situ data and shows that these freshening events are directly related to the short-term offshore extension of the BG and Irrawaddy freshwater, respectively. These data combined with the altimeter sea level anomaly data show that the offshore extending plumes result from freshwater modulated by eddies. During summer, the BG freshwater is modulated by a combination of three closely located eddies: a large anticyclonic eddy(ACE) off the northwestern BoB coast and two cyclonic eddies in the northern BoB. Consequently, the freshwater extends offshore from the river mouth and forms a long and narrow tongue-shaped plume extending southwestward to the central BoB. During winter, the Irrawaddy freshwater is modulated by two continuous ACEs evolved from Rossby wave propagating westward from the Irrawaddy Delta off Myanmar, forming a tongueshaped plume extending to the central BoB. Strong salinity fronts are formed along the boundaries of these tongue-shaped plumes. These findings confirm good capability of the SMAP data to investigate the short-term offshore extension of the BG and Irrawaddy freshwater. This study provides direct evidences of the pathways of the offshore extension of the BG and Irrawaddy freshwater and highlights the role of eddies in the northern BoB freshwater plume variability.

关键词： freshwater plume Bay of Bengal freshening event SMAP Brahmaputra-Ganges and Irrawaddy cyclonic and anticyclonic eddies

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One Case of Diabetes Nephropathy Stage V, Combined Valvular Disease, Total Heart Failure with Diabetes Foot Gangrene

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International Journal of Clinical Medicine 2023年第4期14卷 216-227页

作者： Yubo Xu Zehua Xu Huiwen Li zhilin sun Yuewei Li Department of TCM Prevention and Health Care National Key Clinical Hepatology Hospital Hebei Hepatopathy Hospital of the TCM Shijiazhuang China Department of Nephropathy Hebei Hepatology Hospital of the TCM Shijiazhuang China

The patient was found to have 4+urine sugar by physical examination 14 years ago and was treated with oral hypoglycemic drugs. Insulin was injected intramuscularly nine years ago. Two and a half years ago, it was found that the color of the thumb, index and middle toe of the left foot became black. He went to a third-class hospital in Beijing and was diagnosed as “diabetes foot”. He was treated with “balloon dilation of lower limb blood vessels of diabetes foot”. Half a year ago, the third toe on the right side was broken and treated in the hospital again. “Popliteal artery stent implantation” was given for the diagnosis of “double kidney insufficiency, diabetes foot, left heart failure, combined heart valve disease”, “Hemofiltration therapy” and anti-inflammatory, amino acid supplementation, kidney function protection, anticoagulation, anemia correction and other treatments. Later, he went to our hospital and was diagnosed by the TCM diagnosis: category of consumptive disease, toe or finger gangrene (syndrome/pattern of qi and yin deficiency). Western medicine diagnosed: stage V of diabetes nephropathy, type II diabetes foot gangrene, combined with heart valve disease, hypoalbuminemia, double kidney cyst, moderate anemia, pleural effusion, hyperkalemia, pulmonary infection, and total heart failure. The patient was treated by the Qi-acupuncture therapy of TCM in combination with Chinese and Western medicine Medical treatment made the patient significantly better and discharged.

关键词： Diabetic Nephropathy Stage V Diabetic Foot Gangrene Uremia Combined Valvular Heart Disease Total Heart Failure The Qi-Acupuncture Therapy of the TCM

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粗化层试验与预报

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水力发电学报 2000年第4期19卷 40-48页

作者：孙志林孙志锋浙江大学杭州310028

从试验和理论角度对床面冲刷形成粗化层问题作了研究。基于冲刷粗化试验资料并结合非均匀沙分级起动公式确定了粗化层形成和完全破坏的临界水力条件。文中建立了以非均匀沙分级起动概率为核心可同时预报粗化层级配和冲刷深度的冲刷粗化... 详细信息

从试验和理论角度对床面冲刷形成粗化层问题作了研究。基于冲刷粗化试验资料并结合非均匀沙分级起动公式确定了粗化层形成和完全破坏的临界水力条件。文中建立了以非均匀沙分级起动概率为核心可同时预报粗化层级配和冲刷深度的冲刷粗化多步随机模式 ,预报结果与粗化试验资料颇为一致。

关键词：粗化层预报多步随机模式冲刷深度试验

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跳跃颗粒的计算机图像识别

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模式识别与人工智能 2000年第3期13卷 357-360页

作者：孙志锋孙志林浙江大学电气工程学院杭州310027 浙江大学环境与资源学院杭州310027

本文着重探讨经预处理和区域分割后的单幅图像如何识别出颗粒的方法。首先将区域预截取图像作差分运算并进行垂直投影定位,根据投影量对图像再作截取,然后将截取到的图像块进行阈值分割以得到颗粒所在区域,并通过计算求得颗粒中心点位置。

关键词：图像识别颗粒跳跃非均匀沙计算机

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分汊河道平衡水深方法

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哈尔滨工程大学学报 2019年第1期40卷 61-66页

作者：孙志林高运许丹浙江大学海洋学院浙江杭州310058

为了研究分汊河道的河床演变与航道水深,本文基于水力几何形态关系,得到分汊河道平衡水深计算方法。该方法对于不同断面形态的分汊河道均具有适用性,汊道与单一河道过水断面面积之比为分流比的6/7次方。应用于长江南京以下12. 5 m深水... 详细信息

为了研究分汊河道的河床演变与航道水深,本文基于水力几何形态关系,得到分汊河道平衡水深计算方法。该方法对于不同断面形态的分汊河道均具有适用性,汊道与单一河道过水断面面积之比为分流比的6/7次方。应用于长江南京以下12. 5 m深水航道二期工程,计算得出的落成洲分汊河段断面的平均水深与多年平均水深基本一致,表明了平衡水深理论的可靠性。对福姜沙和世业洲分汊河段工程前的最大通航水深计算,亦与实际情况较为吻合;工程后的预测结果显示工程整治效果明显,世业洲和福姜沙左汊河段均能满足12. 5 m通航水深的要求,但福北水道仍无法达到12. 5 m通航水深。平衡水深方法提供了一种除数学模型和物理模型外预测河床演变趋势,计算出航道能维持的平衡水深,丰富了航道整治理论的同时,也为二期工程的实施提供科学依据与理论指导。

关键词：水力几何形态平衡水深分汊河道河床演变长江航道整治最大通航水深汊道选择

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低温荷载下沥青路面线性损伤特性分析

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中南大学学报（自然科学版） 2016年第7期47卷 2495-2500页

作者：孙志林吴超王辉长沙理工大学特殊环境道路工程湖南省重点实验室湖南长沙410114 广东易山重工股份有限公司广东中山528400

为了研究沥青路面结构在温度荷载作用下的疲劳损伤特性,运用通用有限元软件ABAQUS及其二次开发平台,建立考虑路面材料疲劳损伤模型的沥青路面结构数值计算模型,分析沥青路面在温度荷载反复作用下路面结构损伤的空间分布及演化规律、路... 详细信息

为了研究沥青路面结构在温度荷载作用下的疲劳损伤特性,运用通用有限元软件ABAQUS及其二次开发平台,建立考虑路面材料疲劳损伤模型的沥青路面结构数值计算模型,分析沥青路面在温度荷载反复作用下路面结构损伤的空间分布及演化规律、路面结构水平正应力的空间分布与演化规律。研究结果表明:路面结构损伤主要分布在沥青面层,且面层表面损伤度随着温变次数的增大而逐渐增大,但增大的幅度逐渐减小,当温变次数从0.1万次增大到0.2万次时,损伤度增大0.09,但当温变次数从0.9万次增大到1.0万次时损伤度只增大0.012;面层表面损伤度随着温变幅度的增大而增大,且增大的幅度增大,当变幅从-2℃变为-4℃时,损伤度增大0.033,当变幅从-8℃变为-10℃时,损伤度增大0.154;从面层内的空间分布来看,有损路面与无损路面相比,水平正应力有所减小,且越是靠近面层表面减小的幅度越大,距面层层底6 cm处,应力为0.265 6 MPa,12 cm处为0.290 9 MPa,18 cm处为0.279 7 MPa;随着温变次数增大,面层表面的水平正应力逐渐减小,减小幅度逐渐减小;随着变温幅度增大,面层表面的水平正应力先增大、后减小,有1个峰值点。

关键词：道路工程路面结构损伤力学温度荷载有限元

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