mapeamento de areas de risco 050816
TRANSCRIPT
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PROTEÇÃO
E
DEFESA CIVIL
Maj Passos17ago16
1
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PLANO DE CONTINGÊNCIAS
2
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Anderson Passos, Maj BM
CFO PM 1998
2º BBM
CEDEC
SEDS
SEMAD
BOA
CTS
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REFLEXÕES
Déficit econômico e social com reflexos de longo prazo;
Deficiente controle do uso e ocupação do solo;
Deficiente fiscalização governamental;
Aspectos culturais;
Baixa preparação das comunidades.
AUMENTO DA VULNERABILIDADE ÁREAS DE RISCO
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PREVISÃOOnde e quando.
PREVENÇÃORedução da magnitude.
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Mapeamento de Área de Risco:
Identificação, em carta, dos locais comprobabilidade de ocorrência de umdesastre, considerada a vulnerabilidade ehistórico locais.
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Elevação temporária do nível d´água em um canalde drenagem devida ao aumento da vazão oudescarga.
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Extravasamento das águas do canal de drenagem para asáreas marginais: planície de inundação, várzea ou leitomaior do rio. (enchente acima do nível máximo da calhaprincipal).
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FATORES NATURAIS:
PLUVIOMETRIA; RELEVO; TAMANHO E FORMA DA BACIA; GRADIENTE HIDRÁULICO DO RIO; DINÂMICA DE ESCOAMENTO PLUVIAL.
FATORES ANTRÓPICOS
IMPERMEABILIZAÇÃO DOS TERRENOS; OBRAS E INTERVENÇÕES ESTRUTURAIS DIVERSAS AOLONGO DOS CURSOS D’ÁGUA; EROSÃO E ASSOREAMENTO.
OCORRÊNCIA DE ENCHENTES E INUNDAÇÕES
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Acúmulo momentâneo de águas em uma dada áreadecorrente de deficiência do sistema de drenagem.
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Escoamento superficial concentrado e com alta energia detransporte.
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TALUDE NATURAL - ENCOSTA
SUPERFÍCIE NATURAL INCLINADA UNINDO OUTRAS DUAS COMDIFERENTES POTENCIAIS GRAVITACIONAIS.
H = DIFERENÇA DE
POTENCIAL
GRAVITACIONAL
TALUDE NATURAL
- ENCOSTA
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TALUDE DE CORTE
Talude natural com algum tipo de escavação.
TALUDE ARTIFICIAL
Taludes de aterros diversos (rejeitos, bota-foras, etc).
TALUDE NATURAL - ENCOSTA
TALUDE ARTIFICIAL
(ATERRO) TALUDE DE CORTE
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PERFIL ORIGINAL
TALUDE DE CORTE TALUDE NATURAL
TALUDE ARTIFICIAL (ATERRO)
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DEFINIÇÃO:
Movimentos gravitacionais de massa, mobilizando o solo, arocha ou ambos.
POUCOS PLANOS DE DESLOCAMENTO (EXTERNOS);
VELOCIDADES MÉDIAS (m/h) A ALTAS (m/s);
PEQUENOS A GRANDES VOLUMES DE MATERIAL;
GEOMETRIA E MATERIAIS VARIÁVEIS.
CARACTERÍSTICAS
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ESCORREGAMENTO DE SOLO;
ESCORREGAMENTO DE ROCHA;
RASTEJO OU “CREEP”;
QUEDA DE BLOCOS;
DESPLACAMENTO ROCHOSO;
ROLAMENTO DE MATACÕES;
CORRIDAS DE TERRA;
CORRIDAS DE LAMA;
CORRIDAS DE BLOCOS.
TIPOS DE PROCESSOS
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TIMBÉ DO SUL-SC (1995)
SUA GEOMETRIA CARACTERIZA-SE POR UMA PEQUENA ESPESSURA E FORMARETANGULAR ESTREITA (COMPRIMENTO BEM MAIOR QUE A LARGURA)
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Trincas no terreno
SINAIS DE MOVIMENTAÇÃO
(feições de instabilidade)
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Trincas no terreno
SINAIS DE MOVIMENTAÇÃO
(feições de instabilidade)
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Trincas no terreno
SINAIS DE MOVIMENTAÇÃO
(feições de instabilidade)
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Juiz de ForaMarço 08
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Muitas superfícies de deslocamento;
Movimento semelhante ao de um líquido viscoso;
Desenvolvimento ao longo das drenagens;
Velocidades médias a altas;
mobilização de solo, rocha, detritos e água;
Grandes volumes de material
Extenso raio de alcance, mesmo em áreas planas.
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CONDICIONANTES NATURAIS:
Características dos solos e rochas; Relevo (declividade/inclinação); Vegetação; Clima; Nível d’água.
CONDICIONANTES ANTRÓPICOS:
Cortes e aterros; Desmatamento; Lançamento de água servida em superfície; Fossas sanitárias; Lixo e entulho; Cultivo inadequado.
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PARA ONDE VAI O ESGOTO?SUPERFÍCIE OU CÉU ABERTO
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TEM VAZAMENTOS?
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HÁ MINAS D’ÁGUA NA ENCOSTA?
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PARA ONDE VAI O ESGOTO?ESGOTO CANALIZADO.
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ESTRUTURAS EMBARRIGADAS/DEFORMADAS
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Elevação do nível d`água e coloração turva/barrenta
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TRINCAS NO TERRENO
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TRINCAS NA MORADIA
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DEGRAUS DE ABATIMENTO
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Alto da encosta = queda
Posição média = atingimento e queda
Base da encosta = atingimento
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ZONEAMENTO
Áreas de risco homogêneo.
CADASTRAMENTO
Detalhamento das situações registradas, de mesmo grau deprobabilidade de ocorrência do processo ou risco.
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IDENTIFICAÇÃO, ANÁLISE
E MAPEAMENTO DE
RISCO EM OCUPAÇÕES
URBANAS PRECÁRIAS.
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SETOR 1
SETOR 3SETOR 4
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SETOR 2 (R2)
SETOR 1 (R4)
SETOR 3 (R2)SETOR 4 (R1)
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RISCO SIGNIFICADO OCORRÊNCIAS NOS ÚLTIMOS 5 ANOS
1 BAIXO NÃO HOUVE
2 MÉDIO 1
3 ALTO 1 GRAVE
4 MUITO ALTO 3 GRAVES
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MADEIRA
MISTO
ALVENARIA
AUMENTO DA
VULNERABILIDADE
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IDENTIFICAÇÃO E DELIMITAÇÃO PRELIMINAR DE ÁREA DE RISCO EMFOTOS AÉREAS
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CONCLUSÃO
O mapeamento as áreas de risco é uma etapa
elementar para a elaboração de um plano de
contingências efetivo.
Portanto, deverá ser realizado com a utilização
de critérios técnicos.
86
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Esclarecimento de dúvidas
87
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• Quais são as áreas de risco 1, num município?
• Apenas técnicos podem participar do mapeamento das áreas
de risco?
Verificação
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Muito obrigado !