scholarly journals Influencia de la glaciación en la red de drenaje: el ejemplo de los valles de Respina y Rebueno (Alto Porma, Cordillera Cantábrica, noroeste de España)

2017 ◽  
Vol 43 (1) ◽  
pp. 269 ◽  
Author(s):  
P. J. Danis-Álvarez ◽  
J. Santos-González
Keyword(s):  
Great Influence ◽  
River Network ◽  
Drainage Network ◽  
Southern Slope ◽  
Network Configuration ◽  
Cantabrian Mountains ◽  
Current Configuration ◽  
Geomorphological Processes ◽  
La Red ◽  
Glacial Landforms

The study addresses two valleys in the river Porma basin, on the southern slope of the Cantabrian Mountains, Spain. In the first one, the Respina Valley, there are many glacial evidences, such as cirques, moraines, till or erratic boulders, demonstrating the importance of the glaciation in this valley. The second one, the Rebueno Valley, shows very few glacial landforms restricted to the upper section of the valley. The comparison of the longitudinal and transverse profiles of both valleys, show the great influence of glaciation in the Respina valley relief, contrasting with the fluvial landforms generated in Rebueno valley. In both, distinct geomorphological processes modulated the relief in such a manner that, despite their proximity, they show significant differences in landscape. In addition, the paper addresses the influence of glaciation on the current configuration of the drainage network, which has scarcely been discussed previously. The main changes in drainage network are the generation of a new valley as a result of a big moraine from Silván valley that deviated the Respina river to the south. This is a very significant example of the importance of the glaciation in river network configuration in the Cantabrian Mountains.

scholarly journals Snow cover as a morphogenic agent determining ground climate, landforms and runoff in the Valdecebollas massif, Cantabrian Mountains

2020 ◽  
Vol 46 (1) ◽  
pp. 81-102 ◽  
Author(s):  
A. Pisabarro
Keyword(s):  
Snow Cover ◽  
Physical Environment ◽  
Satellite Images ◽  
Runoff Generation ◽  
Cantabrian Mountains ◽  
Data Loggers ◽  
Geomorphological Map ◽  
Snow Distribution ◽  
Geomorphological Processes ◽  
Early Snowmelt

Snowfalls are important meteorological events affecting the physical environment of the Cantabrian Mountains. This work analyzes the effects of snow on several elements such as relief, landforms, ground climate and snowmelt waters. The ground thermal regime and associated parameters were studied using temperature data loggers and satellite images and were described in combination with observed geomorphological processes and landforms. A geomorphological map was drawn up and trends in climate patterns and runoff were calculated. Ground temperature monitoring in warm years is not optimal, though allow to know the limit conditions for developing cold processes. Results show that geomorphological processes are not significant and that solifluction deriving from snowmelt, is the only active process in years without freeze or with thick snow cover. Snowfall evolution in recent decades in correlation with flow water and climate features provide the certainty that snow distribution also affects efficacy in runoff generation and moves the flow peak in rivers due to early snowmelt.

scholarly journals ANALISES DOS PADRÕES E ESTILOS DE CANAIS A PARTIR DA PAISAGEM GEOMORFOLÓGICA FLUVIAL NA BACIA DO RIO UNA/PE

2020 ◽  
Vol 14 (02) ◽  
pp. 71-92
Author(s):  
Adriana cassiano Silva ◽  
Osvaldo Girão da Silva
Keyword(s):  
River Basin ◽  
Drainage Network ◽  
Feature Structure ◽  
Palabras Clave ◽  
Index Mapping ◽  
Northeastern State ◽  
Longitudinal Profiles ◽  
La Red ◽  
Del Rio ◽  
Channel Patterns

Os estilos fluviais refletem a fisiografia estrutural da rede de drenagem controladas pelos estratos rochosos, retratando na paisagem sua dinâmica, assim como os padrões de canais, que podem ser alterados por processos geomorfológicos, climáticos e antrópicos. O quadro dos estilos fluvial fornece um modelo geomorfológico dos processos espaciais e temporais biofísicos para gestão e planejamento das bacias hidrográficas. O presente trabalho teve como objetivo analisar as influências do comportamento no canal da bacia do rio Una localizado no Nordeste do Estado de Pernambuco, a partir da investigação das feições da drenagem como reflexo da transferência de matéria e energia entre distintos compartimentos e setores do ambiente fluvial.  A metodologia proporcionou uma visão geral de toda área analisada, a partir da avaliação do índice de sinuosidade, mapeamento dos estilos e das feições fluviais, perfis longitudinais e trabalhos de observação em campo. Assim, constatou-se que a influência estrutural na rede de drenagem da referida bacia comandou a retilineidade do canal Una, com quebra no gradiente topográfico, inflexão do canal e vales encaixados. Nesse ambiente, verificou-se que a produção e deposição dos sedimentos estão vinculados as influências do clima tropical. Palavras-Chave: Feição Fluvial; Estrutura; Instabilidade; Deposição de Sedimentos.   ANALYSIS OF PATTERNS AND CHANNEL STYLE FROM THE LANDSCAPE GEOMORPHOLOGICAL FLUVIAL IN RIVER BASIN UNA/ PE Abstract The river styles reflect the structural physiography drainage network controlled by the rock strata, depicting the landscape dynamics, as well as channel patterns, which can be changed by geomorphological, climatic and anthropogenic processes. The fluvial styles of the table provides a geomorphological model of spatial processes and biophysical time for planning and management of river basins. This study aimed to analyze the influence of behavior on the channel of the river basin Una located in the northeastern state of Pernambuco, from the investigation of drainage features reflecting the transfer of matter and energy between different compartments and sections of the river environment. The methodology provided an overview of the whole analyzed area, from the evaluation of the sinuosity index, mapping styles and river features, longitudinal profiles and field observation work. Thus, it was found that the structural influence on the basin drainage network commanded the straightness of Una channel, breaking the topographic gradient, channel inflection and enclosed valleys. In this environment, it found that the production and deposition of sediments are bound influences the tropical climate. Keywords: Fluvial feature, structure, Instability, Deposition of Sediments.   ANÁLISIS DE PATRONES Y CANALES DE ESTILOS DE PAISAJE DEL RÍO GEOMORFOLÓGICO EN UNA DE CUENCA / PE Resumen Los estilos de los ríos reflejan la red estructural de drenaje fisiografía controlado por los estratos de roca, que representa la dinámica del paisaje, así como los patrones de canal, que puede ser cambiado por procesos geomorfológicos, climáticos y antropogénicos. Los estilos fluviales de la tabla proporciona un modelo geomorfológico de los procesos espaciales y el tiempo biofísico para la planificación y gestión de las cuencas hidrográficas. Este estudio tuvo como objetivo analizar la influencia del comportamiento en el canal de la cuenca del río Una ubicada en el nororiental estado de Pernambuco, a cercar de la investigación de las características de drenaje que refleja la transferencia de materia y energía entre los distintos compartimentos y secciones del entorno del río. La metodología proporciona una visión general de toda la zona analizada, de la evaluación del índice de sinuosidad, la cartografía de estilos y características de ríos, perfiles longitudinales y trabajos de observación de campo. Por lo tanto, se encontró que la influencia estructural en la red de drenaje cuenca mandó la rectitud de canal Una, rompiendo el gradiente topográfico, la inflexión del canal y valles cerrados. En este entorno, se encontró que la producción y deposición de sedimentos están obligados influencias del clima tropical. Palabras clave: río de funciones; la estrutura; la inestabilidad; la deposición de sedimentos.

scholarly journals Assessing the Performance of SuDS in the Mitigation of Urban Flooding: The Industrial Area of Sesto Ulteriano (MI)

Proceedings ◽  
2019 ◽  
Vol 48 (1) ◽  
pp. 5
Author(s):  
Roberta D’Ambrosio ◽  
Anacleto Rizzo ◽  
Alessandro Balbo ◽  
Antonia Longobardi
Keyword(s):  
Urban Areas ◽  
Treatment Strategies ◽  
Industrial Area ◽  
Drainage Network ◽  
Urban Centers ◽  
Project Proposal ◽  
Widespread Application ◽  
Event Scale ◽  
Current Configuration ◽  
Effective Manner

Recent development dynamics of urban centers forced administrations to deal more frequently with problems linked to the inability of traditional sewer systems to manage rainwater in a sustainable and effective manner. Currently, several laws require compliance with the quantitative and qualitative stormwater limits to be discharged into watercourses but, in parallel with a “regulatory” approach, integrated strategies are increasingly being developed. A fundamental role is carried out by Sustainable Drainage Systems (SuDS), whose basic principle is the management of rainwater at the source, through the implementation of prevention, mitigation and treatment strategies. This study, starting from a project proposal made by different Italian firms and funded by PoliS-Lombardia, aims to assess the benefits deriving from the widespread application of SuDS in the Sesto Ulteriano industrial area, through a comparison between a scenario that represents the current configuration of the drainage network, and an ideal scenario where SuDS are taken into consideration. SWMM5 software was used, in order to simulate the behavior of the drainage network in contexts without and with SuDS, after the construction of the synthetic rainfall data sets. Although only event scale simulations have been conducted so far, the encouraging results suggest that these systems really contribute can to mitigating the effects of flooding in urban areas.

scholarly journals Predicting the influence of river network configuration, biological traits and habitat quality interactions on riverine fish invasions

2021 ◽  
Author(s):  
Victoria Dominguez Almela ◽  
Stephen C. F. Palmer ◽  
Demetra Andreou ◽  
Phillipa K. Gillingham ◽  
Justin M. J. Travis ◽  
...  
Keyword(s):  
Habitat Quality ◽  
River Network ◽  
Biological Traits ◽  
Network Configuration ◽  
Riverine Fish ◽  
Fish Invasions

scholarly journals Trends in the abundance of Cantabrian Capercaillie Tetrao urogallus cantabricus at leks on the southern slope of the Cantabrian Mountains, north-west Spain

2005 ◽  
Vol 15 (4) ◽  
pp. 397-409 ◽  
Author(s):  
CÉSAR J. POLLO ◽  
LUIS ROBLES ◽  
JUAN M. SEIJAS ◽  
ÁNGEL GARCÍA-MIRANDA ◽  
RAFAEL OTERO
Keyword(s):  
Population Decline ◽  
Small Population ◽  
Limiting Factors ◽  
Tetrao Urogallus ◽  
Southern Slope ◽  
Cantabrian Mountains ◽  
North West ◽  
Area Of Occupancy ◽  
Tetrao Urogallus Cantabricus ◽  
Number Of Males

We analysed the trend of the number of singing males of Cantabrian Capercaillie Tetrao urogallus cantabricus in 207 leks on the southern slope of the Cantabrian mountains, north-west Spain, in the period 1981 to 2003. The area of occupancy in 1981–1982 covered up to approximately 2,070 km2, but in 2000–2003 it was 693 km2, a 66% area reduction in 22 years. The 1981–1982 census estimated a minimum number of 274 singing male Capercaillie on the southern slope, but in 2000–2003 only an estimated 81 males were recorded, a reduction of 70%. A linear regression was used to detect and describe the changes in the size of the total population of the southern slope as well as individual subpopulations. The overall trend for the total subpopulations was a significant decrease in the number of males (y = 39.94−0.018x; R2 = 0.944, P < 0.001). The negative regression slopes indicated that the number of males had fallen in all the subpopulations considered. In the western core area the greatest annual mean rate of decline was detected in the Sierra de Picos de Ancares subpopulation (−6.22%) and in the eastern core in the Sierra de Riaño subpopulation (−3.43%). The principal local limiting factors (habitat fragmentation, human disturbance, small population size and competition) that have caused the population decline are discussed, together with the demographic, genetic and evolutionary consequences for the surviving subpopulations.

scholarly journals Nivel de alteración ecohidrológica en ríos perennes de la cuenca del río Ayuquila-Armería//Level of ecohydrological alteration in perennial rivers of the Ayuquila-Armeria river basin

Biotecnia ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 28-38
Author(s):  
Francia Elizabeth Rodríguez Contreras ◽  
Luis Manuel Martínez Rivera ◽  
Claudia Irene Ortiz-Arrona
Keyword(s):  
National Level ◽  
Multicriteria Analysis ◽  
Flow Regulation ◽  
River Network ◽  
Anthropogenic Pressures ◽  
The Third ◽  
Hierarchical Levels ◽  
La Red ◽  
Del Rio ◽  
High Level

La cuenca del río Ayuquila-Armería es la más grande en el estado de Colima y la tercera en Jalisco, tiene un área de 9,796 km2. Las presiones antropogénicas, como contaminación puntual o difusa, extracciones de agua, regulación del flujo, entre otras, ejercidas a las cuencas pueden alterar la calidad, cantidad y/o temporalidad del agua, la morfología del cauce, la biodiversidad y sus riberas principalmente. El objetivo fue identificar las principales alteraciones ecohidrológicas de los ríos perennes en la cuenca Ayuquila-Armería. Se delimitaron 45 microcuencas de los ríos perennes en la cuenca. Se evaluó el grado de alteración ecohidrológica mediante un análisis multicriterio siguiendo la metodología de Garrido y colaboradores utilizando 13 variables en tres niveles jerárquicos: red fluvial, zona ribereña y microcuenca hidrográfica. Un análisis inexistente hasta el momento. El 33 % de la cuenca se clasifica con un nivel de alteración “alto” y casi un 55 % con un nivel “muy bajo”. Estos resultados difieren a los obtenidos a nivel nacional, donde clasifican a la cuenca Ayuquila-Armería con un nivel de alteración ecohidrológica “alto”. Las microcuencas con mayor nivel de alteración ecohidrológica están afectadas por la modificación en la infraestructura de la red fluvial, relacionada con la agricultura.ABSTRACTThe Ayuquila-Armeria river is the largest basin in the state of Colima and the third in Jalisco, with an area of 9,796 km2. Anthropogenic pressures, such as point or diffuse pollution, water withdrawals, flow regulation, among others, exerted on the basins can alter the quality, quantity and / or temporality of the water, the morphology of the riverbed, biodiversity and its riverbanks mainly. The objective was to identify the main ecohydrological alterations of the perennial rivers in the Ayuquila-Armeria basin. 45 micro-basins of the perennial rivers in the basin were delimited. The degree of ecohydrological alteration was evaluated through a multicriteria analysis following the methodology of Garrido and collaborators using 13 variables at three hierarchical levels: river network, riverine area and hydrographic micro-basin. A non-existent analysis exists so far. Thirty three percent of the basin is classified with a “high” level of alteration and almost 55 % with a “very low” level. These results differ from those obtained at the national level, where they classify the Ayuquila-Armeria basin with a “high” ecohydrological alteration level. Micro-basins with a higher level of ecohydrological alteration are affected by the modification in the infrastructure of the river network, related to agriculture.

scholarly journals ZONEAMENTO AMBIENTAL DA MICROBACIA HIDROGRÁFICA DO AÇUDE DA CACHOEIRA – CEARÁ, BRASIL

2020 ◽  
Vol 5 (19) ◽  
pp. 202014
Author(s):  
Gustavo Leite Gonçalves ◽  
Francimagne Ribeiro da Silva ◽  
Maria Rosimery de Carvalho ◽  
Sarah de Souza Cruz Mendonça ◽  
Joel Medeiros Bezerra
Keyword(s):  
Environmental Planning ◽  
Water Structure ◽  
Google Earth ◽  
Main Body ◽  
Drainage Network ◽  
Land Occupation ◽  
Drainage Channels ◽  
General Data ◽  
La Red ◽  
Qualitative And Quantitative Study

ENVIRONMENTAL ZONING OF MICRO WATERSHED AÇUDE DA CACHOEIRA – CEARÁ, BRAZILZONIFICACIÓN AMBIENTAL DE LA MICRO CUENCA HIDROGRÁFICA DEL AÇUDE DA CACHOEIRA – CEARÁ, BRASILRESUMOA bacia hidrográfica, considerada como um conjunto de terras drenadas por um corpo d’água principal e seus afluentes, representa a unidade mais apropriada para o estudo qualitativo e quantitativo dos recursos hídricos, sendo uma unidade ambiental que possibilita tratar dos componentes e da dinâmica das inter-relações necessárias ao planejamento e à gestão ambiental. Os impactos de degradação em bacias hidrográficas são advindos dos múltiplos usos, má gestão e ações antrópicas, sendo necessários o controle e a regulação de ocupação do solo visando à manutenção da qualidade, quantidade e regularidade da água para seus diversos usos. Dessa forma, o presente estudo teve por objetivo realizar a delimitação da Microbacia Açude da Cachoeira – MAC, localizada em maior parte no município de Aurora, estado do Ceará, bem como identificar e discutir dados gerais sobre a rede de drenagem, os parâmetros morfométricos, carta temática hidrográfica, relevo e Áreas de Preservação Permanente – APP’s. Os dados foram obtidos por meio do software gratuito QGIS com auxílio da ferramenta Google Earth Pro para a determinação da microbacia e rede de drenagem, além da delimitação das APP’s dos corpos hídricos e análise das potencialidades. Como resultados, constatou-se que a rede de drenagem da MAC apresenta baixa distribuição do escoamento, no qual oferece um menor risco a enchentes em picos de intensidades chuvosas. Além disso, seus canais de drenagem dispõem de um ordenamento hídrico de quarta ordem e seu escoamento global a classifica como uma bacia endorreica.Palavras-chave: Análise Morfométrica; Rede de Drenagem; Semiárido Brasileiro.ABSTRACTThe watershed, considered as a set of lands drained by a main body of water and its tributaries, represents the most appropriate unit for the qualitative and quantitative study of water resources, being an environmental unit that allows to treat the components and use the necessary interrelationships for environmental planning and management. The impacts of degradation in watersheds are the result of multiple uses, mismanagement and anthropic actions, requiring the control and regulation of land occupation in order to maintain the quality, quantity and regularity of water for its various uses. Thus, the present study aimed to delineate the Açude da Cachoeira watershed - ACMW, located mostly in the municipality of Aurora, Ceará state, as well as to identify and discuss general data about the drainage network, the morphometric parameters, hydrographic thematic chart, relief and Permanent Preservation Areas – PPA’s. The data were obtained through the free software QGIS with the aid of the Google Earth Pro tool for the determination of the micro watershed and drainage network, as well as the delimitation of water bodies PPA’s and potentiality analysis. As a result, it was found that the ACMW drainage network has low runoff distribution, which offers a lower risk of flooding at rainy peak. In addition, its drainage channels have a fourth order water structure and its global flow classifies it as an endorheic basin.Keywords: Morphometric Analysis; Drainage Network; Brazilian Semiarid.RESUMENLa cuenca hidrográfica, considerada como un conjunto de tierras drenadas por un cuerpo principal de agua y sus afluentes, representa la unidad más apropiada para el estudio cualitativo y cuantitativo de los recursos hídricos, siendo una unidad ambiental que permite tratar dos componentes de las interrelaciones dinámicas necesarias para la planificación y gestión ambiental. Los impactos de la degradación en las cuencas hidrográficas son el resultado de múltiples usos, mala gestión y acciones antrópicas, que requieren el control y la regulación de la ocupación de la tierra para mantener la calidad, cantidad y regularidad del agua para sus diversos usos. Por lo tanto, el presente estudio tuvo como objetivo delinear la micro cuenca hidrográfica del Açude da cachoeira- MHAC, ubicada principalmente en el municipio de Aurora, estado de Ceará, así como identificar y discutir datos generales sobre la red de drenaje, los parámetros morfométricos, carta temática hidrográfica, relieve y áreas de preservación permanente - APP's. Los datos se obtuvieron a través del software gratuito QGIS con la ayuda de la herramienta Google Earth Pro para la determinación de la red de micro cuencas y drenaje, además de la delimitación de las aplicaciones de los cuerpos de agua y el análisis de las potencialidades. Como resultado, se descubrió que la red de drenaje MHAC tiene una baja distribución de escorrentía, lo que ofrece un menor riesgo de inundación en el pico lluvioso. Además, sus canales de drenaje tienen un ordenamiento hidrico de cuarto orden y su flujo global lo clasifica como una microcuenca endorreica.Palabras clave: Análisis Morfométrico; Red de Drenaje; Semiárido Brasileño.

Monitoring and modelling drainage network dynamics of a Mediterranean catchment

2020 ◽  
Author(s):  
Alfonso Senatore ◽  
Alessio Liotti ◽  
Massimo Micieli ◽  
Nicola Durighetto ◽  
Gianluca Botter ◽  
...  
Keyword(s):  
Climatic Variability ◽  
Network Dynamics ◽  
River Network ◽  
River Networks ◽  
Good Representation ◽  
Drainage Network ◽  
Topographic Wetness Index ◽  
Research Activity ◽  
Wide Range ◽  
Contraction Dynamics

&lt;p&gt;Empirical evidence indicates that the active part of the drainage networks, i.e. that characterized by flowing water, is not static but, conversely, it experiences significant expansion/contraction dynamics produced by the interactions between hydrological and climatic variability, morphological features and soil properties in the contributing catchment. The expansion and contraction dynamics of the &quot;wet&quot; component of the river network can be identified in a wide range of climatic conditions, particularly in the headwaters. In these areas, the observed river network dynamics largely depend on the capacity of the upstream drainage area to concentrate surface runoff in channelized sites.&lt;/p&gt;&lt;p&gt;The study presents a research activity carried out in the framework of the European project &quot;DyNET: Dynamical River Networks&quot; (http://www.erc-dynet.it/), specifically aimed at analysing in detail the processes and agents overseeing changes in form and in the length of river networks in a Mediterranean environment. The contribution describes the first results achieved in the southernmost of the basins under investigation in the DyNET project, namely the Turbolo creek catchment (Calabria, Southern Italy). Bi-weekly surveys were conducted in two sub-catchments having a total area of more than 1 km&lt;sup&gt;2&lt;/sup&gt;, both during the recession (contraction) and reactivation (expansion) phases of the drainage network. The empirical data were used for the validation of a statistical model of the wet network dynamics, designed to estimate the total length of the active network over time. This length was distributed spatially on the river network in an objective way by defining a two-way relationship between active stream length and the Topographic Wetness Index (TWI). The modelling of the network contraction and expansion dynamics was possible using a few meteorological and hydrological variables. The combined use of information on the overall length of the network and the TWI led to a reasonably good representation of the drainage network dynamics over space and time.&lt;/p&gt;

scholarly journals Modeling inorganic carbon dynamics in the Seine River continuum in France

2020 ◽  
Vol 24 (5) ◽  
pp. 2379-2398
Author(s):  
Audrey Marescaux ◽  
Vincent Thieu ◽  
Nathalie Gypens ◽  
Marie Silvestre ◽  
Josette Garnier
Keyword(s):  
Co2 Emissions ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Treatment Plant ◽  
River Network ◽  
Total Alkalinity ◽  
Drainage Network ◽  
River Continuum ◽  
Seine River ◽  
Wwtp Effluent

Abstract. Inland waters are an active component of the carbon cycle where transformations and transports are associated with carbon dioxide (CO2) outgassing. This study estimated CO2 emissions from the human-impacted Seine River (France) and provided a detailed budget of aquatic carbon transfers for organic and inorganic forms, including the in-stream metabolism along the whole Seine River network. The existing process-based biogeochemical pyNuts-Riverstrahler model was supplemented with a newly developed inorganic carbon module and simulations were performed for the recent time period 2010–2013. New input constraints for the modeling of riverine inorganic carbon were documented by field measurements and complemented by analysis of existing databases. The resulting dissolved inorganic carbon (DIC) concentrations in the Seine aquifers ranged from 25 to 92 mg C L−1, while in wastewater treatment plant (WWTP) effluents our DIC measurements averaged 70 mg C L−1. Along the main stem of the Seine River, simulations of DIC, total alkalinity, pH and CO2 concentrations were of the same order of magnitude as the observations, but seasonal variability was not always well reproduced. Our simulations demonstrated the CO2 supersaturation with respect to atmospheric concentrations over the entire Seine River network. The most significant outgassing was in lower-order streams while peaks were simulated downstream of the major WWTP effluent. For the period studied (2010–2013), the annual average of simulated CO2 emissions from the Seine drainage network were estimated at 364±99 Gg C yr−1. Results from metabolism analysis in the Seine hydrographic network highlighted the importance of benthic activities in headwaters while planktonic activities occurred mainly downstream in larger rivers. The net ecosystem productivity remained negative throughout the 4 simulated years and over the entire drainage network, highlighting the heterotrophy of the basin. Highlights CO2 emission from the Seine River was estimated at 364±99 Gg C yr−1 with the Riverstrahler model. CO2 riverine concentrations are modulated by groundwater discharge and instream metabolism. CO2 emissions account for 31 % of inorganic carbon exports, the rest being exported as DIC.

scholarly journals THALWEG DETECTION FOR RIVER NETWORK CARTOGRAPHY IN FOREST FROM HIGH-RESOLUTION LIDAR DATA

2018 ◽  
Vol XLII-4 ◽  
pp. 241-247
Author(s):  
E. Guilbert ◽  
S. Jutras ◽  
T. Badard
Keyword(s):  
Data Structure ◽  
High Resolution ◽  
Point Clouds ◽  
River Network ◽  
Environmental Conservation ◽  
Drainage Network ◽  
Triangulated Irregular Network ◽  
Forested Areas ◽  
Surface Network ◽  
Traditional Approaches

<p><strong>Abstract.</strong> This paper addresses the problem of extracting the drainage network in forested areas. A precise description of the drainage network including intermittent streams is required for the planning of logging operations and environmental conservation. LiDAR provides now high-resolution point clouds from which the terrain is modelled and the drainage extracted but it also brings some challenges for traditional approaches. First, the raster DTM is interpolated from LiDAR ground points and has to be split in tiles for processing, adding approximations. Second, drainage enforcement techniques alter the terrain and rely on parameters difficult to fix and limiting the optimisation of the process. In this context, we discuss a new approach aiming at: (1) Designing a data structure to model the terrain with a Triangulated Irregular Network in order to avoid interpolation. This data structure must enable the distribution of data and processes across several nodes in Big data architectures and eventually, the processing of complete watersheds with no tiling. (2) Modelling the river network through thalwegs and avoiding the filling and breaching operations. Thalweg detection is more robust, removing the need for filling and breaching. However, it yields a very dense network requiring a simplification step. Combining this model and the architecture will enable the design and modelling of a new tool for river network computation directly from LiDAR ground points. In this paper, we mainly discuss the second point and propose to model the drainage by a network of thalwegs computed from the terrain. Thalwegs are extracted from the surface network, a topological structure formed of peaks, pits and saddles as vertices and ridges and thalwegs as vertices. We present preliminary results comparing the thalweg network and the drainage network.</p>

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