scholarly journals Dynamics and Economics of Shallow Lakes: A Survey

2021 ◽  
Vol 13 (24) ◽  
pp. 13763
Author(s):  
Dmitry Gromov ◽  
Thorsten Upmann
Keyword(s):  
Linear Model ◽  
Shallow Lakes ◽  
Shallow Lake ◽  
Regime Shift ◽  
Multiple Steady States ◽  
Typical Representative ◽  
Lake Model ◽  
Ecological Problems ◽  
Multiple Domains ◽  
Substantial Interest

We provide an overview of the results devoted to the analysis of the dynamics and economics of shallow lakes, spanning the period from 1999 until now. A shallow lake serves as a typical representative of an ecological system subject to (possibly irreversible) regime shifts. The dynamics of a shallow lake are described by a non-linear model with multiple steady states and multiple domains of attraction and is thus suitable to model the evolution of an ecosystem featuring both resilience within a domain of stability and an abrupt regime shift outside of it. Beyond this, the shallow lake model can also be viewed as a metaphor for many other ecological problems. Due to the broad applicability of this model, there is substantial interest in the management of shallow lakes and both their optimal regulation and competitive usage.

Survey on threshold detection methods of regime shift in shallow lake ecosystem

2013 ◽  
Vol 33 (11) ◽  
pp. 3280-3290
Author(s):  
李玉照 LI Yuzhao ◽  
刘永 LIU Yong ◽  
赵磊 ZHAO Lei ◽  
邹锐 ZOU Rui ◽  
王翠榆 WANG Cuiyu ◽  
...  
Keyword(s):  
Shallow Lake ◽  
Regime Shift ◽  
Detection Methods ◽  
Lake Ecosystem ◽  
Threshold Detection

scholarly journals Sediment Phosphate Release Flux Under Hydraulic Disturbances in the Shallow Lake of Chaohu, China

2021 ◽  
Author(s):  
Wenguang LUO ◽  
Yao Yue ◽  
Jing Lu ◽  
Lina Pang ◽  
Senlin Zhu
Keyword(s):  
Shallow Lakes ◽  
Release Rate ◽  
Surface Sediment ◽  
Shallow Lake ◽  
Chaohu Lake ◽  
Small Motion ◽  
Phosphate Release ◽  
Wide Range ◽  
Sediment Phosphate ◽  
Motion Mode

Abstract Quantifying the effect of hydraulic disturbances on sediment phosphate release is a key issue in the water quality assessment of lakes, especially for the shallow lakes which are susceptible to winds and waves. Here, we sampled the original sediment columns from 12 positions in the eastern, central, and western areas of the Chaohu Lake, a representative shallow lake in China, and observed phosphate release under three levels of hydraulic disturbances in the laboratory. When the disturbance was weak and the surface sediment of bottom mud moved individually (the Individual Motion Mode), sediment phosphate release rate was insignificant (0.24 mg/m2/d). When the disturbance was medium and only a small percentage (<16%) of surface sediment started to move (the Small Motion Mode), phosphate release rate sharply increased to 4.81 mg/m2/d. When the disturbance was further strengthened and most (≥16%) of the surface sediment moved (the General Motion Mode), phosphate release rate was more than doubled (10.23 mg/m2/d). With the increase of hydraulic disturbance intensity, the variation range of phosphate release also became wider. Spatial distribution showed that the release rate varies the most in the western area, followed by the eastern and the central areas. By extrapolating the experimental results to the real scale, we found the phosphate release fluxes would probably fall within a wide range between 203.43 kg/d to 7311.01kg/d under different levels of hydrodynamic disturbances with considerably affects phosphate release from shallow lakes. This study also has implications for the pollutant management in other shallow lakes.

scholarly journals First record of the endemic phytophilous cladoceran Celsinotum candango Sinev & Elmoor-Loureiro, 2010, in Minas Gerais state, in a threatened shallow lake at Serra do Gandarela

2015 ◽  
Vol 15 (4) ◽  
Author(s):  
Francisco Wagner Moreira ◽  
Emerson Silva Dias ◽  
Eneida Maria Eskinazi Sant'Anna
Keyword(s):  
Shallow Lakes ◽  
Shallow Lake ◽  
Aquatic Ecosystems ◽  
National Park ◽  
Federal District ◽  
First Record ◽  
Minas Gerais ◽  
Mountain Ridge ◽  
Aquatic Biodiversity ◽  
Minas Gerais State

This study describes the occurrence of the phytophilous cladoceran Celsinotum candango, which has been considered, up to now, an endemic species of the Brazilian Cerrado, with only two previous records in the wetlands of Brasilia, Federal District. The cladoceran has now been registered at Coutos Lake (“Lagoa dos Coutos”), an altitudinal, temporary shallow lake, located in ironstone outcrops at Serra do Gandarela, Minas Gerais state. This mountain ridge was recently turned into an integral protection conservation unit, the Gandarela National Park. However, many shallow lakes, including this one, were excluded from the delimited area of the park, and are now at risk of disappearing due to expansion of mining activities. The information provided here reveals the importance of these shallow lakes to aquatic biodiversity, and reinforces the need for the inclusion of these rare aquatic ecosystems into the recently created Gandarela National Park.

scholarly journals Effects of Human Activities on the Diversity of Waterbirds Wintering in a Shallow Lake of the Middle and Lower Yangtze River Floodplain, China

Diversity ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 302
Author(s):  
Xinjian Wang ◽  
Jinyun Chen ◽  
Lizhi Zhou
Keyword(s):  
Species Composition ◽  
Human Activity ◽  
Shallow Lakes ◽  
Shallow Lake ◽  
Yangtze River ◽  
Paddy Fields ◽  
Aquaculture Ponds ◽  
Lower Yangtze ◽  
Lake Wetlands ◽  
Wetland Habitats

Human activity is the major factor driving the wetland degradation in shallow lakes. Human exploitation of lake wetlands alters the habitats of wintering waterbirds, and, in turn, waterbird diversity in the shallow lakes. In the present study, we surveyed species composition, abundance, and habitat characteristics of waterbirds in three types of wetland habitats (natural lakeside wetlands, paddy fields, and aquaculture ponds) at Caizi Lake, a shallow lake in the middle and lower Yangtze River during the wintering period, and investigated the effects of habitat change driven by human activity on the diversity of wintering waterbirds. There were significant differences in species composition and abundance among the three wetland habitats (natural lakeside wetlands, aquaculture ponds, and artificial paddy fields); however, there were no significant differences among the habitats with respect to the number of waterbirds. The numbers of overwintering waterbird species and waterbird individuals in aquaculture ponds and lakeside wetlands were significantly higher than the numbers in the paddy fields, indicating that wintering waterbirds prefer natural lake wetlands and aquaculture ponds. Principal component analysis of the three wetland habitat types revealed that factors influencing waterbird diversity include wetland area, vegetation cover, water level, and degree of human interference. Therefore, minimizing human interference and ensuring suitable habitats at specific periods could facilitate the maintenance of waterbird diversity.

scholarly journals Is the future of large shallow lakes blue-green? Comparing the response of a catchment-lake model chain to climate predictions

2017 ◽  
Vol 141 (2) ◽  
pp. 347-361 ◽  
Author(s):  
Fabien Cremona ◽  
Sirje Vilbaste ◽  
Raoul-Marie Couture ◽  
Peeter Nõges ◽  
Tiina Nõges
Keyword(s):  
Shallow Lakes ◽  
Lake Model ◽  
The Future ◽  
Model Chain

scholarly journals Reconsideration of winds, wind waves, and turbulence in simulating wind-driven currents of shallow lakes in the Wave-current Coupled Model (WCCM) version 1.0

2021 ◽  
Author(s):  
Tingfeng Wu ◽  
Boqiang Qin ◽  
Anning Huang ◽  
Yongwei Sheng ◽  
Shunxin Feng ◽  
...  
Keyword(s):  
Drag Coefficient ◽  
Shallow Lakes ◽  
Shallow Lake ◽  
Lake Taihu ◽  
Wind Waves ◽  
Coupled Model ◽  
Field Observations ◽  
Radiation Stress ◽  
Wind Driven Currents ◽  
Wave Induced

Abstract. Winds, wind waves, and turbulence are essential variables and playing critical role in regulating a series of physical and biogeochemical processes in large shallow lakes. However, parameterizing winds, waves, currents and turbulence and simulating the interaction between them in large shallow lakes haven’t been evaluated strictly because of a lack of field observations of lake hydrodynamics process. To address this problem, two process-based field observations were conducted to record the development of summer and winter wind-driven currents in Lake Taihu, a large shallow lake in China. Based on these observations and numerical experiments, a wave-current coupled model (WCCM) is developed by rebuilding expression of wind drag coefficient, introducing wave-induced radiation stress, and adopting a simple turbulence scheme, and then used to simulate wind-driven currents in Lake Taihu. The results show that, the WCCM can accurately simulate the upwelling process resulting from the wind-driven currents during the field observations. Comparing with other model, there is a 42.9 % increase of WCCM-simulated current speed which is mainly attributed to the new expression of wind drag coefficient. Meanwhile WCCM-simulated current direction and field are also improved due to the introduction of wave-induced radiation stress. Furthermore, the use of the simple turbulent scheme in the WCCM makes the simulation of the upwelling processes more efficient. The WCCM provides a sound basis for simulating shallow lake ecosystems.

ECOBAS — A tool to develop ecosystem models exemplified by the shallow lake model EMMO

2008 ◽  
Vol 3 (2) ◽  
pp. 154-169 ◽  
Author(s):  
Torsten Strube ◽  
Joachim Benz ◽  
Sascha Kardaetz ◽  
Rainer Brüggemann
Keyword(s):  
Shallow Lake ◽  
Ecosystem Models ◽  
Lake Model

scholarly journals A Kernel Embedding–Based Approach for Nonstationary Causal Model Inference

2018 ◽  
Vol 30 (5) ◽  
pp. 1394-1425 ◽  
Author(s):  
Shoubo Hu ◽  
Zhitang Chen ◽  
Laiwan Chan
Keyword(s):  
Linear Model ◽  
Real World ◽  
Causal Model ◽  
Real World Data ◽  
Model Inference ◽  
Causal Direction ◽  
Causal Graphs ◽  
Nonstationary Data ◽  
Multiple Variables ◽  
Multiple Domains

Although nonstationary data are more common in the real world, most existing causal discovery methods do not take nonstationarity into consideration. In this letter, we propose a kernel embedding–based approach, ENCI, for nonstationary causal model inference where data are collected from multiple domains with varying distributions. In ENCI, we transform the complicated relation of a cause-effect pair into a linear model of variables of which observations correspond to the kernel embeddings of the cause-and-effect distributions in different domains. In this way, we are able to estimate the causal direction by exploiting the causal asymmetry of the transformed linear model. Furthermore, we extend ENCI to causal graph discovery for multiple variables by transforming the relations among them into a linear nongaussian acyclic model. We show that by exploiting the nonstationarity of distributions, both cause-effect pairs and two kinds of causal graphs are identifiable under mild conditions. Experiments on synthetic and real-world data are conducted to justify the efficacy of ENCI over major existing methods.

scholarly journals Effect of climate change on thermal-ice regime of shallow lakes compared to deep lakes: Case study of lakes in the temperate zone (Northern Poland)

2018 ◽  
Vol 78 (1) ◽  
Author(s):  
Włodzimierz Marszelewski ◽  
Bożena Pius
Keyword(s):  
Water Temperature ◽  
Surface Waters ◽  
Shallow Lakes ◽  
Thermal Regime ◽  
Shallow Lake ◽  
Deep Lakes ◽  
Deep Lake ◽  
Ice Regime ◽  
Ice Phenomena

The objective of this study is to determine the usefulness of results of hydrological observations (1961-2015) carried out in a deep lake for the assessment changes in the ice-thermal regime of a shallow lake. The paper is based on results of daily values of surface water temperature and ice phenomena in shallow Lake Łebsko and deep Lake Charzykowskie. Similar, statistically significant, positive trends of water temperature were determined in both lakes (0.26°C 10 year-1 in Lake Łebsko and 0.25°C 10 year-1 in Lake Charzykowskie). The fastest increase in mean monthly water temperature in the analysed period (1961-2015) occurred in May (3.37°C in Lake Charzykowskie) and April (2.76°C in Lake Łebsko). The majority of elements of the thermal regime of surface waters in shallow lakes were generally determined to be similar to the same elements in deep lakes, and the effect of climatic changes on the thermal regime of both lakes was found to be similar. Less similarity is observed between elements of the ice regime, particularly in date of decline of the ice cover.  

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